a.me &T"~

.....,- ...•;.~ -.-.,.--'-:-:'- -'WAVES-V()('A.BUIAItY ACTlVllY FOR

WAVE ON

elect a word from the wave.below that fits in the following sentepces. Somewords can besed twice.

,wave amplitude bats -medium rarefraetion hertz intensity

tl"aDSVerBe compression frequency soundlongitudinal trough Doppler decibels

crest ultrasonic

1. The ofa Sound wave determines a sound's pitch.

2. Ocean waves are waves because the water and the waves move

at right angles to each other.

3. In a longitudinal wave, the space where there are few particles of medium is called a

4. Some can produce ultrasonic 8Ouuda. which they use for navi-

gational purposes.

6. A is a disturbance that moves energy through apace or matter.

6. Sound is a wave because the medium moves back and forth in

the same direction as the wave travels. -

7. The of'a transverse wave is the highest point, or point of max-

imum displacement, of the wave.

8. The sound of an approaching train whistle increases in pitch because of the

_...;...., effect.

9. Sounds that people cannot bear are called sounds.

,10. Air is one through which sound can travel.

11. The frequency of sound waves is measured in units called -------

52

II jI 1\ 1I !.I.1

~};

i'*

VOCa\BVIAI.Y ActMTY (~d)":~. - ..

·8·-

..1.2. In a 801lJld. wave, the apace where air particles are pushed together is called. a

13. A wave is produced by a vibrating object that causes the air

molecules to vibrate.

14. The intensity or loudness of a sound is meuured in units called ------'

15. Wave refers to the maximum distances medium molecules an

diapJ.aeed.

16. The loWeSt displacement of a wave is called the wave's --------'

17. A rocket engine produces a wave ofbigh •which registers 200 OJ

_the decibel scale.

18. Dogs can hear sounds in the 25.000-& rep..

19. FM radio statiOIl8 broadcast at frequencies in the mega- range.

20. Sounds above 85 can damage our ears.

53

('

NIme Class 0.••

" CHAPTER 21 Sound

VOCABULARY REVJ' !

From Ihe answer list un rhe right. dllK}iC the (crill whkh loe51c"lIIvlel"~ or answers each state-ment Oil Ibe Icfl:,Wrile the Illliii!oer of Ihe answer ill Ih<·p•.••jlcr spa('c uf the Imx. If rllll chooselhe correct answers, the slim of lire numbers in each row 'llTlISS ,lIld dowu, ill lhc fi'lIl' corners, intbe four center boxes, and in the diagonal bolles will be Ihe same," .

"

StlltelJleD..~.

A. A string instrumentB. Unpleasant or unwanted soundC. Vibration of air molecules we Gill bearD. A measure of a sound wave's intensitye. Tells how high or low the sound isF. Sound frequency below the range HI' human hearingG. One vibration reinforcing another, IIf the same narura! h'cqucncyH. The change in pitch when you Of ii sound source movesI. Back and fnnh movementJ. Occurs when one object causes another 10 vibrate ill the original

frequencyK. Sound frequency above the range of human hearingL Depends on an object's size, shape; and materialII. Reflected sound wavesN. Occurs when waves from one objeci cause another ()I~jecl with Ihe

same natural frequency to vibraleO. A way of finding distance of !lIings under waterP. Pleasant sound with regular wave pattern

f

I~ l~ I~ I~ '~ !~I

L-

A cB

E F c

! /q~N

1 1

I K

M o

1m:.<\I. _

ADlwcrs

1. drum2. waves3. decibels4. infrasonic5. vibrationI. sonar7. sympathetic

vibrauons8. natural frequency9. resonance

10. banjo11. ultrasonic12. echo13. noise14. Doppler effect15. speed16. pitch11. sound11. musicit. forced vibrations

D I

NAME DAn:~.

H IL 1

I

p

" i<EINFORCEMENT Chapter 1

The Nature of Sound rut Page$ 464-4l

Ddermi'flJ! whether l~ italiciud term I!Wk&s each siI1.tnnerI.t tnu flrJ. Jj.thl. ~ is t'rtu, unite IN WO!1I

"true" in tM blGnJc.lj tAt sI4Iemml is/. 1UIiie in tAt.blaT/June term tJuU..~ tjre.~ true.

1. A ro:reftJdiqn is the area of a sound wave where particles are less .--.--- ...-. - ..------ ....- dense. .. _

2. Sound travel.&more slowly through gtlU$ than it does through liquil

8. The ~ of 2. sound is iu highness or lowness.

4. As the amplitude of a wave decreases, iu i~ also increases.

. -. - . -. '-- 5. The Doppler effect is an apparent change in the mOMnCl.' of a SOUl

.. . .. '. _.__ _ _ : . , .Oecra--~e7--------.~ - ------6.-As energy is added .to..a.w.a.ve>-it.ump-li_tJlg~~d i~ lIM!!'fII!!!e.

------ ------------'1;;-'fhe speed ofa sound wave-depends·partly on the temt-aJ.uu of th(. medium.

-- .'-- __-.'- . __$..J1le pik:b of.~.so~d depends on the ~ of the sound waves.that produce it. -. -- .....------ ... --...-.-. -. - . ...

~~--------~--------9. Air and water are examp~ <?~_!l~~_~uih which 5Ouncr-traveu::

;:-:;-::. '. : ..- -H). Ahigb musicalnoli! has a ~ ~ than a lownote.

11. In a tnm.svmewave, matter vibrates in 'the direction the wave travel

InW drawing btlow, WeJrtiP.t train and the spqrts car 1m trawling besitU each otIt6 at the same spt;edal.. tMmrinwhistilubloumrg. . .._ ._. ._.. __.:...._. __ . H __ • __ • •• _

12. Describe how the frequency of the sound waves produced by the whistle and the piu:h of dI_... _w.hl!tlcwould sound tn_each of the fonowing:

---=~'.::: :.' .-:.. - . ... .- -... . ...---- _.- --- ".- L: 'Michael, who is waiting to cross the tracks at point A. --:;--

b. Sandra, who is driving the sportS car __ ~------ __ ----_--

c. Tony, who is an engineer on the train _

d. Jane. whose car has stopped at position B _

125~ ••• IlINioot.~~~.MotriI,.",...,--"- •••..••••...••.•.•.••...•.•.•••••,....