12 HW Sound Review
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Last updated 12:40 AM on 3/3/23
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42 Terms
1
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A pulse of compressed air that is part of a sound wave is a rarefaction.
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false
2
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Even a steel bridge can collapse because of resonance.
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true
3
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Sound waves are produced by
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vibrating objects.
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4
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A sound wave is a
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\n longitudinal wave.
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5
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Sound can travel through solids, liquids, gases, and even a vacuum.
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false
6
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When the handle of a tuning fork is held solidly against a table, the sound becomes louder and the length of time the fork vibrates
becomes shorter.
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7
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Resonance occurs when
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an object is forced to vibrate at its natural frequency.
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8
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Suppose you sound a tuning fork at the same time you hit a 1053-Hz note on the piano and hear 3 beats/sec. You tighten the piano string very slightly and now hear 4 beats/sec. What is the frequency of the tuning fork?
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\n 1050 Hz
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9
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Which of the following would be most likely to transmit sound with the highest speed?
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Steel in a bridge
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10
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An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic sound that travels 1530 m/s in seawater, and finds a 10-second time delay of the echo to the ocean floor and back. The ocean depth there is
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7650 m.
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11
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When an object is forced to vibrate at its natural frequency, its vibration amplitude increases.
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true
12
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Almost everything that exists has a natural frequency.
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true
13
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Compared to the speed of light, sound travels
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\n slower.
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14
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When an object is forced to vibrate at its natural frequency, resonance occurs.
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true
15
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The word "pitch" refers to the period of a sound wave.
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false
16
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An explosion occurs 340 km away. Given that sound travels at 340 m/s, the time the sound takes to reach you is
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more than 200 s.
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17
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A general rule for estimating the distance in kilometers between an observer and a lightning bolt is to count the number of seconds between seeing and hearing the bolt, and divide by
3
18
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Sound travels faster in air if the air is
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warm
19
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Noise-canceling earphones are an example of
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\n destructive interference.
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20
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In order for sound from a speaker to reach a listener, air near the speaker must travel to the listener.
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false
21
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Sound waves cannot travel in
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a vacuum
22
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In which one of the following does sound travel the fastest?
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Ice
23
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A sound wave that has a wavelength of 2 m in room-temperature air has a frequency of about
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170 Hz
24
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The Tacoma Narrows Bridge collapsed due to
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resonance
25
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A 1134-Hz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. What is the frequency of the piano string?
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Not enough information given to determine
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26
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If you are standing equally distant from two television sets that are emitting the exact same sound waves, the sound
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is louder because the waves constructively interfere.
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27
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Sound waves in air are a series of
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all of the above
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28
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The phenomenon of beats results from sound
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interference.
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interference.
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29
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Compared to the threshold of hearing, a sound level of 10 decibels is
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10 times more intense.
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30
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A singer shattering crystal glass with her voice is a demonstration of
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resonance.
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31
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You are water-skiing on a lake, and you are being pulled by a noisy motorboat. Another motor boat is speeding through the water a bit ahead of your boat so that rarefactions from its motor hit you when compressions from your boat’s motor hit you. You hear
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almost nothing due to destructive interference.
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almost nothing due to destructive interference.
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32
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How many times a minute will you be in step with a friend when you walk at 77 steps per minute and your friend walks at 65 steps per minute?
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12
33
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Beats can be heard when two tuning forks
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\n have almost the same frequency and are sounded together.
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34
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Compared to a sound of 10 decibels, a sound of 50 decibels has
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\n 10,000 times the intensity.
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35
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The speed of a sound wave depends on
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the air temperature.
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36
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When an object is disturbed slightly and then left alone, it vibrates at its natural frequency.
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true
37
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If you strike a tuning fork and hold it on a table, the sound becomes relatively loud.
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\n True
38
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If the sounding board were left out of a music box, the music box would
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make little "plinks" that you could hardly hear.
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39
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Two whistles produce sounds of wavelengths 3.4 m and 3.2 m. What is the beat frequency produced?
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\n 6.3 Hz
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40
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Beats are produced when two tuning forks, one of frequency 240 Hz and the other of frequency 248 Hz, are sounded together. The frequency of the beats is
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8 Hz
41
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A tuning fork of frequency 300 Hz will resonate if a sound wave incident on it has a frequency of
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150 Hz.
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42
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A 680-Hz sound wave travels at 340 m/s in air, with a wavelength of
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0\.5 m.