Physics Principles and Problems 2009

Chapter 15: Sound

Standardized Test Practice

1
Which sound wave described in the table has a loudness of 60 dB?

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  Need a Hint?
A)wave 1
B)wave 2
C)wave 3
D)wave 4
2
What is the wavelength of wave 4 in air at 20°C? (The speed of sound in 20°C air is 340 m/s.).

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A)0.47 m
B)0.94 m
C)2.1 m
D)2.5 m
3
The speed of sound is 343 m/s in medium A and 1493 m/s in medium B. For sound with a frequency of 440 Hz, what is the difference between the wavelength in medium A and the wavelength in medium B?
A)1.0 m
B)2.6 m
C)4.2 m
D)4.4 m
4
Two clarinet players are tuning their instruments. One plays a perfect G at 392 Hz. The other is slightly sharp and plays at 397 Hz. What is the beat frequency?
A)2.5 Hz
B)5 Hz
C)7.5 Hz
D)10 Hz
5
A 392-Hz tuning fork is held over a closed-pipe resonator. If the speed of the sound is 343 m/s, what is the spacing between the resonances?
A)1.14 m
B)0.438 m
C)0.571 m
D)0.875 m
6
A car, moving at 24 m/s, approaches a pedestrian standing on the side of the road. The horn of the car emits a sound wave with a frequency of 482 Hz. What frequency is heard by the pedestrian? (The speed of sound through the air in this problem is 340 m/s.)
A)480 Hz
B)450 Hz
C)520 Hz
D)540 Hz
7
The loudness of sound as perceived by the ear and brain depends mainly on the sound's _________.
A)Doppler effect
B)amplitude
C)velocity
D)pitch
8
Most sounds are _________ that comprise more than one frequency.
A)vibrating objects
B)varying decibels
C)amplitudes
D)complex waves
9
As a train speeds away from a station, its whistle sounds with a frequency of 624 Hz. For a listener standing on the platform of the station, sound waves from the whistle have a frequency of 580 Hz. What is the velocity of the train relative to the listener at the station?
A)27 m/s away from the listener
B)30 m/s away from the listener
C)36 m/s away from the listener
D)33 m/s away from the listener
10
The fundamental frequency and harmonics can be described in terms of _________.
A)resonance
B)the Doppler effect
C)beats
D)noise
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