# Units 11 and 12 Review

Waves, Light and Sound

 Navigate to Answers for: [ Questions #1-#14 | Questions #15-#28 | Questions #29-#42 | Questions #43-#56 | Questions #57-#68 ] [ #57 | #58 | #59 | #60 | #61 | #62 | #63 | #64 | #65 | #66 | #67 | #68]

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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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

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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)

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### Units 11 and 12 Review - Questions Only Navigate to Answers for: [ Questions #1-#14 | Questions #15-#28 | Questions #29-#42 | Questions #43-#56 | Questions #57-#68 ]

Comments and suggestions can be sent by e-mail to Tom Henderson.