light & wave
TRANSCRIPT
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?
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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?
&
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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
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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
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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
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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
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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
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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
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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
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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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