Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The
speed of sound in ____ is greater than the speed of sound in water. a. | air | c. | cork | b. | steel | d. | water vapor | | | | |
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2.
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If
the intensity of a sound decreases, the ____ decreases. a. | wavelength | c. | spinal
pitch | b. | speed | d. | loudness | | | | |
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3.
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A
sound intensity above ____ may cause permanent hearing damage. a. | 0dB | c. | 120dB | b. | 90dB | d. | 150dB | | | | |
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4.
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For
the Doppler effect to occur, ____. a. | the sound source must be moving | b. | the listener
must be moving | c. | both source and listener must be
moving | d. | either source or listener must be
moving | | |
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5.
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Since
ancient times, people have used ____ instruments to send signals, accompany important rituals, and
entertain one another. a. | brass | c. | string | b. | woodwind | d. | percussion | | | | |
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6.
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Reverberation in concert halls is caused by ____ of sound. a. | reflections | c. | refractions | b. | diffractions | d. | diffusions | | | | |
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7.
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A
system of using the reflection of underwater sound waves is ____. a. | acoustics | c. | sonar | b. | radar | d. | resonance | | | | |
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8.
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Scientists and engineers may recommend carpets and draperies for the walls of a
concert hall to reduce excess ____. a. | echolocation | c. | frequency | b. | reverberation | d. | amplitude | | | | |
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