light & wave

8/17/2019 Light & Wave

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1 Red light travelling in glass strikes a glass-air boundary. Some light is reflected

and some is refracted. Which diagram correctly shows the reflection andrefraction?

2 In the diagram, X is a converging !conve"# lens.

$oints labelled F are one focal length from the lens and %oints labelled & F are twofocal lengths from the lens. If an ob'ect is %laced at (, at which %oint is the image

of its base formed?

3 What ha%%ens to light as it %asses from glass into air?

A Its fre)uency decreases because its s%eed decreases.B Its fre)uency increases because its s%eed increases.

C Its wavelength decreases because its s%eed decreases.

D Its wavelength increases because its s%eed increases.

4 * swimming %ool is lit by a lam% in the bottom of the %ool. +he directions of

three rays from the lam% are shown.

Which of the marked angles is the critical angle for the light?



5 * ray of light is incident on one side of a rectangular glass block.

Its %ath is %lotted through the block and out through another side.

Which %ath is not %ossible?

6 ight rays are deviated by a %rism.

+he deviation angle d is measured for light rays of different fre)uency, including blue light and red light.

Which gra%h is correct?

&



7 +he diagram shows a %atient having her eyes tested. * chart with letters on it is

%laced behind her and she sees the chart reflected in a %lane mirror.

ow far away from the %atient does the chart seem to be?

A &m B /m C 0m D 1m

8 +hree students stand & m a%art in front of a %lane mirror which is 2 m long.

Student is standing o%%osite the mid-%oint of the mirror.

ow many students can see the images of the other two?

A 3 B C & D 29 +he diagram shows the image of a clock in a %lane mirror.

What time is shown?A 3&4&0 B 3&420 C 354&0 D 35420

10 *n ob'ect %laced in front of a %lane mirror at ( %roduces an image at I.

If the ob'ect moves towards the mirror in the direction shown by the arrow, in

which direction does the image move?

2



11 +he diagram shows the waves in a ri%%le tank in which the water in %arts $ and 6

is of different de%ths.

ow do the wavelengths and the s%eeds V and V & of the waves com%are in $ andin 6?

12 * wave source of fre)uency 333 7 emits waves of wavelength 3.3m.ow long does it take for the waves to travel &033m?

A &.0 s B /.3 s C &0 s D 33 s

13 +he diagram shows %art of a s%ring that is shaken from side to side to %roduce a

wave.

+he distance between successive %eaks is 3.83 m and the fre)uency is &.0 7.

ow long does it take for a wave to travel 2.3 m along the s%ring?

A 3.&3 s B 3.03 s C &.3 s D 0.3 s14 * vertical stick is di%%ed u% and down in water at $. In two seconds, three wave

crests are %roduced on the surface of the water.

Which statement is true?

* 9istance X is the am%litude of the waves.: 9istance is the wavelength of the waves.

; <ach circle re%resents a wavefront.

9 +he fre)uency of the waves is 27.

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15 Water waves travel more slowly in shallow water than in dee% water.

Which diagram shows what will ha%%en to %lane waves in dee% water when they

enter shallow water?

16 +he diagram shows a wave.

ow many wavelengths are there between X and ?

17 If a wave of velocity c is of fre)uency = and wavelength > , then for a wave of

velocity &c, the fre)uency and wavelength could be

Frequency Wavelength

A &= &> B =& > C =& &D = &>

18 Which line gives an e"am%le of a longitudinal wave and describes its vibrations?

0



19 +he diagram shows how dis%lacement varies with time as a wave %asses a fi"ed

%oint.

What is the fre)uency of this wave?

A 3.&0 7 B 3.03 7 C .3 7 D &.3 7

20 =or infra-red radiation, shiny surfaces areA good absorbers and good emitters.B good absorbers and %oor emitters.

C %oor absorbers and good emitters.D %oor absorbers and %oor emitters.

21 X-rays, visible light and radio waves are all %art of the electromagnetic s%ectrum.

What is the correct order of increasing wavelength?

22 Which ty%e of wave is used to send tele%hone signals to and from a satellite?A infra-red waves

B light wavesC microwavesD sound waves

23 Which does not normally use infra-red radiation?A electric grillB intruder alarm

C television remote controller D sunbed

24 Which statement is true for all electromagnetic waves?

A +hey are longitudinal.

B +hey can be seen.C +hey have the same fre)uency in air.D +hey travel at the same s%eed in a vacuum.

8



25 * ray of light is incident on one side of a rectangular glass block, so that the angle

of refraction is /3@ in the glass. Which diagram correctly shows a %ossible %ath of

this ray? A+he critical angle for glass is /&@.B

26 =or a certain %arallel-sided glass block, the value of sin i/ sin r

is .03.* ray of light %asses through the block and emerges at an angle of 83@ to the

surface of the block.

What is the value of the angle marked X ?A 5.0@ B 20@ C /3@ D /C.0@

27 * ray of red light enters a semi-circular glass block normal to the curved surface.

Which of the following correctly shows the %artial reflection and refraction of the

ray?

1



28 * ray of light enters a glass block at an angle of incidence i %roducing an angle of

refraction r in the glass.

Several different values of i and r are measured, and a gra%h is drawn of sin i

against sinr. Which gra%h is correct?

29 In which diagram is the %ath of the light ray not correct?

30 What causes refraction when light travels from air into glass?

A +he am%litude of the light waves changes.B +he colour of the light changes.C +he fre)uency of the light waves changes.

D +he s%eed of the light changes.

C



31 +he diagram shows the direction of movement of a wavefront X in medium

and, later, in medium &.

ow do the s%eed and fre)uency of the wave change when the wavefront %asses

into medium &?

32 Water waves change direction when they move from shallow water to dee% water.

What is the name of this effect?

A diffraction

B dis%ersionC reflectionD refraction

33 * vibrator sends ri%%les across the surface of water. +hey run closer together as

they travel further from the vibrator.+his shows that the ri%%les

A decrease in fre)uency.

B increase in fre)uency.C slow down.D s%eed u%.

34 * surf-board moves at a s%eed of 0 ms on the crest of a wave. +he distance between wave crests is 3 m. What is the fre)uency of the wave motion?

A 3.07 B &7 C 07 D 3 7

5



35 +he diagram shows waves set u% in a ro%e by a student moving the free end u%

and down at a steady rate.

What is the wavelength of the waves shown, and what will be the wavelengthwhen the student doubles the fre)uency at which the free end is moved u% and

down?

36 * set of straight water ri%%les in a ri%%le tank travels over a thick, triangular

%ers%e" sheet. Which diagram shows the wave %attern?

37 +he diagram re%resents some of the main %arts of the electromagnetic s%ectrum.

What are the numbered %arts?

& 2 /

A radio waves ultraviolet visible light X-raysB radio waves visible light ultraviolet X-raysC visible light ultraviolet X-rays radio waves

D visible light ultraviolet radio waves X-rays

3



38 * flash of lightning and the corres%onding thunder cla% are detected 8 s a%art. It is

calculated that the lightning struck about C33 m away. (n which assum%tion is

the calculation based?

A ight reaches us almost instantaneously, but sound travels at 233 m s.B ight travels 233 m s faster than sound.C Sound reaches us almost instantaneously, but light travels at 233 m s.

D +he sound of the thunder was emitted 8 s after the flash.

39 +he diagram shows a ray of light entering a block of glass.

Which numbered angles are the angles of incidence and of refraction?

40 +he diagram shows a water wave in a ri%%le tank.

+he wave has a s%eed of & cms at . +he wave crosses a boundary !" where

the distance between crests changes from 2.3 cm to .0 cm. What is the velocityof the wave at %oint #?

A 2.3 cmsB 8.3 cms

C & cmsD &/ cms

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light & wave

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