# Units 10, 11 and 12 Review

Waves, Light and Sound

1. A single disturbance that moves from point to point in a medium is called

 a. period. b. periodic wave. c. wavelength. d. pulse.

What is a Wave? (8 seconds)

2. What type of wave is produced when the particles of the medium are vibrating to and fro in the same direction of wave propagation?

 a. longitudinal wave. b. sound wave. c. standing wave. d. transverse wave.

Categories of Waves (10 seconds)

3. What type of wave is produced when the particles of a medium are vibrating at right angles to the direction of wave propagation?

 a. longitudinal wave. b. sound wave. c. standing wave. d. transverse wave.

Categories of Waves (10 seconds)

4. A transverse wave is traveling through a medium. See diagram below. The particles of the medium are moving.

 a. parallel to the line joining HU. b. along the line joining TZ. c. perpendicular to the line joining HU. d. at various angles to the line TZ. e. along the curve THVIXJZ.

Categories of Waves (10 seconds)

5. If the energy in a longitudinal wave travels from south to north, the particles of the medium move

 a. from north to south, only. b. both north and south. c. from east to west, only. d. both east and west.

Categories of Waves (10 seconds)

6. As a pulse travels though a uniform medium, the speed of the pulse

 a. decreases. b. increases. c. remains the same.

The Speed of a Wave (10 seconds)

7. The speed of sound depends most on the

 a. amplitude of the sound wave. b. intensity of the sound. c. loudness of the sound. d. transmitting medium. e. pitch of the sound.

The Speed of a Wave (10 seconds)

8. As a wave travels into a medium in which its speed increases, its wavelength

 a. decreases. b. increases. c. remains the same.

The Wave Equation (7 seconds)

9. As a wave passes into a new medium, which characteristics of the wave NEVER changes?

 a. speed b. frequency c. wavelength

The Speed of a Wave (10 seconds)

10. What is the amplitude of the wave in diagram 5-21?

 a. 0.03 m. b. 0.04 m. c. 0.05 m. d. 0.06 m.

The Anatomy of a Wave (6 seconds)

11. The wavelength of the wave in diagram 5-21 (above) is

 a. 0.03 m. b. 0.04 m. c. 0.06 m. d. 0.08 m.

The Anatomy of a Wave (6 seconds)

12. A wave X meters long passes through a medium with a speed of Y meters per second. The frequency of the wave could be expressed as

 a. Y/X cycles/sec. b. X/Y cycles/sec. c. XY cycles/sec. d. (X + Y) cycles/sec.

The Wave Equation (7 seconds)

13. How many complete waves are shown in diagram 5-39?

 a. 1 b. 2 c. 3 d. 1.5

The Anatomy of a Wave (6 seconds)

14. If the distance from point A to point G in diagram 5-39 (above) is 60 cm, then the wavelength is

 a. 20 cm. b. 40 cm. c. 60 cm. d. 90 cm.

The Anatomy of a Wave (6 seconds)

15. The number of cycles of a periodic wave occuring per unit time is called the wave's

 a. wavelength. b. period. c. amplitude. d. frequency.

Frequency and Period of a Wave (11 seconds)

16. A source S generates circular waves on a lake. If the frequency of the source is 2.0 Hz and the wave speed is 5.0 m/s then the distance between adjacent wave crests is

 a. 0.20 m. b. 0.40 m. c. 1.25 m. d. 2.5 m. e. 10 m.

The Anatomy of a Wave (6 seconds) | The Wave Equation (7 seconds)

17. What is the frequency of a water wave that has a speed of 0.4 meter per second and a wavelength of 0.02 meter?

 a. 10 hertz. b. 20 hertz. c. 0.008 hertz. d. 0.5 hertz.

The Wave Equation (7 seconds)

18. Which one of the following properties of a wave is independent of all the others?

 a. amplitude. b. frequency. c. period. d. velocity. e. wavelength.

The Speed of a Wave (10 seconds)

19. A pendulum makes 40 vibrations in 20 s. Its period is

 a. 0.50 Hz. b. 0.50 s. c. 2.0 Hz. d. 2.0 s. e. 8.0 x 102 Hz.

Frequency and Period of a Wave (11 seconds)

20. A period of 0.005 s yields a frequency of

 a. 20 HZ b. 50 Hz c. 200 Hz d. 500 Hz e. 2000 Hz

Frequency and Period of a Wave (11 seconds)

21. The number of waves generated per second by a source is called the frequency of the source.

 a. True b. False

Frequency and Period of a Wave (11 seconds)

22. The SI unit for frequency is hertz.

 a. True b. False

Frequency and Period of a Wave (11 seconds)

23. Doubling the frequency of a wave source doubles the speed of the waves.

 a. True b. False

The Wave Equation (7 seconds)

24. A vibrating object with a frequency of 200 Hz produces sound which travels through air at 360 m/s. The number of meters separating the adjacent compressions in the sound wave is

 a. 0.900. b. 1.80. c. 3.60. d. 7.20. e. 200.

The Anatomy of a Wave (6 seconds) | The Wave Equation (7 seconds)

25. If the frequency of a wave is doubled and if the speed remains constant, its wavelength is

 a. quartered. b. halved. c. unchanged. d. doubled.

The Wave Equation (7 seconds)

26. The line X represents the boundary between two dissimilar springs. A pulse is shown approaching the boundary in diagram 5-7. Which one of the sketches in diagram 5-8 shows a possible configuration of the system shortly after the pulse reaches the boundary?

 a. A b. B c. C d. E

Boundary Behavior (14 seconds)

27. When a pulse reaches a boundary between two different media, it will be

 a. reflected, only. b. transmitted, only. c. partly reflected and partly transmitted. d. neither reflected nor transmitted.

Boundary Behavior (14 seconds)

28. The diagram 5-62 shows a transverse pulse traveling along a heavy rope toward its junction with a lighter rope. Which of the diagrams 5-63 best illustrate the ropes at the instant that the reflected pulse again passes through its orignal position marked X?

 a. A b. B c. C d. D e. E

Boundary Behavior (14 seconds)

29. A wave whose speed in a spring is 4.4 m/s enters a second spring. The wavelength changes from 2.0 m to 3.0 m. The wave in the second spring travels at

 a. 1.46 m/s. b. 2.2 m/s. c. 2.9 m/s. d. 4.4 m/s. e. 6.6 m/s.

Boundary Behavior (14 seconds)

30.The diagram 5-19 shows a portion of a rope in which a disturbance XY travels in the direction of the arrow. If the disturbance XY meets a similar disturbance traveling in the opposite direction, which one of the configurations of the rope, in diagram 5-20, could NOT appear?

 a. A b. B c. C d. D e. E

Boundary Behavior (14 seconds)

31. A rope 2 m long is hanging vertically from a vibrator. It is noted that a single pulse travels to the end of the rope in 0.5 s. What frequency should be used in the vibrator to maintain three whole waves in the rope?

 a. 3/4 Hz b. 4/3 Hz c. 4 Hz d. 6 Hz e. 8 Hz

The Wave Equation (7 seconds)

32. In an experiment to find the speed of waves in a rope, a standing wave pattern is established as shown in diagram 5-53. The vibrating end makes ninety vibrations per minute. The speed of the waves is

 a. 3 m/s. b. 6 m/s. c. 180 m/s. d. 360 m/s. e. 540 m/s.

The Wave Equation (7 seconds)

33. Standing waves are produced in a string by two sources each having a frequency of 100 Hz. The distance from the 2nd node to the 5th node is 60 cm. The wavelength in centimeters of the original traveling wave is

 a. 50. b. 40. c. 30. d. 20. e. 15.

Mathematics of Standing Waves (2 seconds)

34. Waves generated at A are reflected at B to produce a standing wave as shown in diagram 5- 56. The number of antinodes in the diagram is

 a. 3. b. 5. c. 6. d. 7. e. 12.

Nodes and Anti-nodes (8 seconds)

35. The standing wave pattern in diagram 5-56 (above) is representative of the ____ harmonic.

 a. third b. fifth c. sixth d. seventh e. twelth

Harmonics and Patterns (2 seconds)

36. The distance between successive nodes in a standing wave pattern is

 a. 1/4 wavelength. b. 1/2 wavelength. c. 3/4 wavelength. d. 1 wavelength. e. 2 wavelengths.

Nodes and Anti-nodes (8 seconds)

37. A node is a point where there is always

 a. a double crest. b. a double trough. c. constructive interference. d. destructive interference. e. a double rarefaction.

Nodes and Anti-nodes (8 seconds)

38. Constructive interference of waves occurs when two crests meet.

 a. True b. False

Interference of Waves (14 seconds)

39. Which phenomemon is produced by two or more waves passing simultaneously through the same region?

 a. refraction. b. diffraction. c. interference. d. reflection.

Interference of Waves (14 seconds)

40. Two pulses in a stretched spring approach P as shown in diagram 5-85. Which diagram in diagram 5-86 best illustrates the appearance of the spring when each pulse meets at P?

 a. 1 b.2 c.3 d.4

Interference of Waves (14 seconds)

41. The diagram 5-81 illustrates

 a. interference. b. diffraction. c. the Doppler effect. d. polarization.

The Doppler Effect (7 seconds)

42. In diagram 5-81 (above), a person positioned at point A would perceive __________ frequency as the person positioned at point B.

 a. a higher b. a lower c. the sam

The Doppler Effect (7 seconds)

43. A vibrating object is necessary for the production of sound.

 a. True b. False

Sound is a Mechanical Wave (13 seconds)

44. Sound is transmitted through the air by means of transverse waves

 a. True b. False

Sound is a Longitudinal Wave (9 seconds)

45. On a warm day, the speed of sound in air is greater than on a cool day

 a. True b. False

The Speed of Sound (6 seconds)

46. A sound wave has a wavelength of 3.0 m. The distance between the center of a compression and the center of the adjacent refraction is

 a. 0.75 m. b. 1.5 m. c. 3.0 m. d. 6.0 m. e. impossible to calculate without knowing frequency.

Sound is a Pressure Wave (12 seconds)

47. Which one of the following CANNOT transmit sound?

 a. liquid air. b. gaseous oxygen. c. liquid water. d. solid steel. e. perfect vacuum.

Sound is a Mechanical Wave (13 seconds)

48. Which one of the following factors determines the pitch of a sound?

a. the amplitude of the sound wave.

b. the distance of the sound wave from the source.

c. the frequency of the sound wave.

d. the phase of different parts of the sound wave.

e. the speed of the sound wave.

Pitch and Frequency (7 seconds)

49. A certain note is produced when a person blows air into an organ pipe. If the person blows slightly harder, the most probable change will be that the sound wave will increase in

 a. amplitude. b. frequency. c. pitch. d. speed. e. wavelength.

Intensity and the Decibel Scale (5 seconds)

50. A girl moves away from a source of sound at a constant speed. Compared to the frequency of the sound wave produced by the source, the frequency of the sound wave heard by the girl is

 a. lower. b. higher. c. the same.

The Doppler Effect and Shock Waves (9 seconds)

51. If the electromagnetic waves received on earth from a source in outer space appear to be increasing in frequency, the distance between the source and the earth is probably

 a. decreasing. b. increasing. c. remaining the same.

The Doppler Effect and Shock Waves (9 seconds)

52. The increase in amplitude of a vibrating object, due to periodic impulses of the same frequency as the natural frequency of the vibrating object, is called

 a. beats. b. fundamental. c. interference. d. overtone. e. resonance.

Resonance (9 seconds)

53. A tuning fork, producing sound waves of wavelength W, causes resonance in a closed air column. The length of the air column could NOT be

 a. 1/4 W b. 2/4 W c. 3/4 W d. 5/4 W e. 7/4 W

Closed-End Air Columns (21 seconds)

54. One vibrating body can set another body into vibration if the natural frequencies of the two bodies are the same.

 a. True b. False

Resonance (9 seconds)

55. If a source of sound of wavelength W is held near any air column (open or closed), the difference between the successive lengths of the air column at which resonance will occur is 1/2 W.

 a. True b. False

Open-End Air Columns (21 seconds) | Closed-End Air Columns (21 seconds)

56. An organ pipe closed at one end will resonate if its length is equal to half of the wavelength of the sound in the pipe.

 a. True b. False

Closed-End Air Columns (21 seconds)

57. The shortest length of pipe, closed at one end, that resonates when a vibrating tuning fork is held near its open end is 20 cm. The wavelength of the sound is

 a. 5 cm. b. 10 cm. c. 20 cm. d. 40 cm. e. 80 cm.

Closed-End Air Columns (21 seconds)

58. In order for two sound waves to produce audible beats, it is essential that the two waves have

 a. the same amplitude. b. the same frequency. c. the same number of overtones. d. slightly different amplitudes. e. slightly different frequencies.

Interference and Beats (21 seconds)

59. A stretched string vibrates with a fundamental frequency of 100 Hz. The frequency of the second harmonic is

 a. 25 Hz b. 50 Hz c. 100 Hz d. 200 Hz e. 400 Hz

Fundamental Frequency and Harmonics (12 seconds)

60. The first resonant length of a tube, open at both ends, is 40 cm. The wavelength of the sound which will produce this resonance is

 a. 10 cm. b. 20 cm. c. 40 cm. d. 80 cm. e. 160 cm.

Open-End Air Columns (21 seconds)

61. The diagrams in diagram 5-32 represent four different standing wave patterns in air column of equal length. Which of the columns is/are vibrating at its/their fundamental frequency?

 a. I only b. II only c. I and II only d. II and III only e. III and IV only

Open-End Air Columns (21 seconds)

62. The diagrams in diagram 5-32 (above) represent four different standing wave patterns in air columns of equal length. Which of the columns will produce the note having the highest pitch?

 a. I b. II c. III d. IV e. All column produce notes having the same pitch

Open-End Air Columns (21 seconds)

63. An air column closed at one end filled with argon resonates with a 200 Hz tuning fork. The shortest resonant length is 42.5 cm. The speed of the sound must be.

 a. 85.0 m/s. b. 170 m/s. c. 340 m/s. d. 470 m/s. e. 940 m/s.

Closed-End Air Columns (21 seconds)

64. A violinist plays a note whose fundamental frequency is 220 Hz. The third harmonic of that note is 800 Hz.

 a. True b. False

Guitar Strings (8 seconds)

65. If tuning forks of 256 Hz and 258 Hz are sounded at the same time, 2 beats will be heard in 2 s.

 a. True b. False

Interference and Beats (21 seconds)

66. A tuning fork of frequency 384 Hz is sounded at the same time as a guitar string. 30 beats are heard in 10 s. The frequency of the string in hertz is

 a. 38.4. b. 354 or 414. c. 369 or 399. d. 374 or 394. e. 381 or 387.

Interference and Beats (21 seconds)

67. Three spotlights (red, green, and blue) are used in order to cast light on a stage. What color will be formed by the addition of two of these three colors? Fill in the grid below.

## X

68. Different colors of paper are illuminated with different primary colors of light. Determine the colors of light absorbed by the paper (if any), the colors of light reflected by the paper (if any), and the appearance of the paper.

### Appearance

a.
White
White

b.
Cyan
White

c.
Yellow
White

d.
Red
Yellow

e.
Red
Blue

f.
Red
Cyan

g.
Red
Red

h.
Magenta
Red

i.
Yellow
Red

j.
Cyan
Red

k.
Cyan
Blue

l.
Yellow
Blue

m.
Yellow
Green

n.
Yellow
Cyan

o.
Yellow
Magenta

Color Subtraction (18 seconds)