Waves and Light Unit Exam Practice Questions.doc

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Waves and Light Unit Exam Practice

Questions

1. What are the amplitude and wavelength of the wave shown below ?

amplitude = 0.10 m, wavelength = 0.30 m amplitude = 0.10 m, wavelength =

0.60 m

amplitude = 0.20 m, wavelength = 0.30 m amplitude = 0.20 m, wavelength =

0.60 m

2. The diagram below shows two waves, A and B. The phase difference between A

and B is

0o 45o 90o 180o

3. The periodic wave in the diagram below has a frequency of 40. Hz. What is the

speed of the wave ?

13 m/s 27 m/s 60. m/s 120 m/s

4. As shown in the diagram below, a transverse wave is moving with velocity v

along a rope.

http://www.geocities.com/capecanaveral/8236/incorrect.html

http://www.geocities.com/capecanaveral/8236/correct.html







































In which direction will segment X move as the wave passes through it ?

down, only up, only down, then up, then down up, then down, then up

5. The diagram below represents shallow water waves passing through two small

openings, A and B, in a barrier.

How much longer is the length of path AP than the length of path BP ?

one wavelength two wavelengths three wavelengths four wavelengths

6. When a transverse wave is moving through a medium, what is the action of the

particles of the medium ?

They travel through the medium with the wave.

They vibrate parallel to the direction the wave is moving.

They vibrate perpendicular to the direction the wave is moving.

They remain at rest.

7. If the period of a wave is doubled, its wavelength will be

halved doubled unchanged quartered

8. A wave spreads into the region behind a barrier. This phenomenon is called

diffraction reflection refraction interference

9. If the frequency of a sound wave is 400 Hz, its period is closest to

2.27 x 10-3 s 0.75 s 1.33 s 3.31 x 102 s

10. Wave motion in a medium transfers

energy only mass only both mass and energy neither mass nor energy



































































11. A car's horn is blowing as the car moves at a constant velocity toward an

observer. Compared to the frequency of

the sound wave emitted by the horn, the observed frequency is

constant and lower constant and higher the same varying and lower

12. The change in the direction of a wave when it passes obliquely from onemedium to another is called

diffraction interference reflection refraction

13. Which wave phenomenon could not be demonstrated with a single wave pulse ?

standing wave diffraction reflection refraction

14. As a wave enters a medium, there may be a change in the wave's

frequency speed period phase

15. As a wave is refracted, which characteristic of the wave will remainunchanged ?

velocity wavelength frequency direction

16. The number of water waves passing a given point each second is the wave's

wavelength amplitude frequency velocity

17. Sound waves with a constant frequency of 250 Hz are traveling through air at

STP. What is their wavelength ?

0.76 m 1.3 m 250 m 83,000 m

18. What is the frequency of a wave with a period of 0.005 s ?

5 Hz 100 Hz 200 Hz 2000 Hz

19. What is the wavelength of a 30 Hz periodic wave moving at 60 m/s ?

0.50 m 2.0 m 20. m 1800 m

20. Two waves have the same frequency. Which wave characteristic must also be

identical for both waves?

phase amplitude intensity period

21. A single vibratory disturbance which moves from point to point in a materialmedium is known as a

phase pulse distortion wavelet

22. Which point on a wave is 180o out of phase with a wave crest?

rest position crest trough

23. If the frequency of a sound wave remains constant, its energy can be varied by

changing its

amplitude speed wavelength period


















































































































24. In which type of wave is the disturbance parallel to the direction of wave

travel ?

torsional longitudinal transverse circular

25. A driver of a car hears the siren of an ambulance which is moving away from

her. If the actual frequencyof the siren is 2000 Hz, the frequency heard by the driver may be

1900 Hz 2000 Hz 2100 Hz 4000 Hz

26. In order for standing waves to form in a medium, two waves must

have the same frequency have different amplitudes have different

wavelengths travel in the same direction

27. In which diagram below could the light source and optical device be used to

demonstrate the phenomenon of dispersion ?

(1) (2) (3) (4)

28. A ray of monochromatic light traveling in air enters a rectangular glass block obliquely and strikes a plane mirror

at the bottom. Then the ray travels back through the glass and strikes the air-glass

interface. Which diagram below

best represents the path of this light ray ? [N represents the normal to the surface.]









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(1) (2) (3) (4)

29. A ray of monochromatic light (f = 5.09 x 1014 Hz) traveling in air is incident on

an interface with a liquid (n = 1.4)

at an angle of 45o, as shown in the diagram below.

The angle of refraction for the light ray is closest to

10o 20o 30o 40o

30. The diagram below shows light rays in air about to strike a glass window.


























When the rays reach the boundary between the air and the glass, the light is

totally reflected totally refracted partially reflected and partially diffracted

partially reflected and partially refracted

31. The diagram below shows parallel rays of light incident on an irregular surface.

Which phenomenon of light is illustrated by the diagram ?

diffraction refraction regular reflection diffuse reflection

32. A light ray is incident on a plane mirror as shown in the diagram below.

Which ray best represents the reflected ray ?

A B C D

33. A ray of light hits a mirror at an angle of incidence of 30o. What is the angle

between the incident and reflected rays ?

15o 30o 45o 60o










































34. A person is standing 5 meters from a plane mirror. The chair in front of the

person is 2 meters from the mirror.

What is the distance between the person and the image he observes of the chair ?

7 m 2 m 3 m 10. m

Base your answers to questions 9 and 10 on the diagram below, which represents alight ray traveling from air to Lucite

to medium Y and back into air.

35. The sine of angle "X" is

0.333 0.500 0.707 0.886 36. Light travels slowest in

air, only Lucite, only medium Y, only air, Lucite, and medium Y

37. The diagram below represents a ray of monochromatic light (f = 5.09 x 1014 Hz)

passing from

medium X (n = 1.46) into fused quartz.































Which path will the ray follow in the quartz ?A B C D

38. A ray of monochromatic light is traveling in flint glass. The ray strikes the flint

glass-air interface at an angle

greater than the critical angle for flint glass. Which diagram best represents the

path of this light ray ?

(1) (2) (3) (4)

39. The diagram below shows an antenna emitting an electromagnetic wave.





















In what way did the electrons in the antenna produce the electromagentic wave ?

by remaining stationary by moving at constant speed upward, only

by moving at constant speed downward, only by accelerating alternatively

upward and downward

40. Which diagram best represents light emitted from a coherent light source ?

(1) (2) (3) (4)

41. Which of the following colors has the highest frequency ?

red yellow blue violet

42. Which of the following colors has the shortest wavelength ?

red yellow blue violet

43. Which of the following electromagnetic energies has the shortest wavelength ?

infrared yellow light orange light x-rays



















































44. In a double-slit experiment, which of the following colors will produce the

largest distance between maxima ?

yellow green blue violet

45. The fact that light can be polarized lead to the conclusion that light is a

particle compressional wave torsional wave transverse wave

46. Longitudinal (compressional) waves cannot be

refracted diffracted reflected polarized

47. When light passes through a double-slit, it is

reflected and refracted reflected and polarized diffracted and interferes with

itself diffracted and polarized

48. A light ray reflects off a mirror. If the angle between the incident and reflected

rays is 30o, the angle of incidence is

15o 30o 60o 90o

49. When light passes from water into lucite, it will

bend away from the normal bend toward the normal not bend at all

50. If the speed of light in a medium is 1.5 x 108 m/s, what is the index of refraction

of the medium ?

1.0 1.5 2.0 2.5

51. When light bounces off a piece of paper, we see the paper because of

diffuse reflection regular reflection diffraction dispersion

52. A ray of monochromatic light travels from air into a material whose index of

refraction is 1.4. What is the

speed of light in this material ?

1.4 x 108 m/s 2.1 x 108 m/s 2.5 x 108 m/s 3.0 x 108 m/s

53. Light travels from medium A into medium B. The angle of refraction in

medium B is 90o. Compared to the index

of refraction of medium A, the index of refraction of medium B must be

greater lower the same

54. What is the color of light with a frequency of 5.7 x 1014 Hz ?

red orange green blue

55. How far will light travel in a vacuum in one minute ?

1.8 x 1010 m 5.0 x 106 m 2.0 x 10-7 m 3.0 x 1012 m

56. As monochromatic light passes from air into glass, which of the following will

remain the same ?

wavelength speed frequency

57. What occurs when light passes from water into flint glass ?Its speed decreases, its wavelength becomes shorter, and its frequency remains



































































































































the same.

Its speed decreases, its wavelength becomes shorter, and its frequency increases.

Its speed increases, its wavelength becomes longer, and its frequency remains the

same.

Its speed increases, its wavelength becomes longer, and its frequency decreases.

58. If the angle of incidence in air is 30o, what is the sine of the angle of refraction

in crown glass ?

1.52 0.33 0.50 0.28




















Waves and Light Unit Exam Practice Questions.doc

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