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Chapter 12 Test

Terms in this set (20)

Sound waves

a. are a part of the electromagnetic spectrum
b. do not require a medium for transmission
c. are longitudinal waves
d. are transverse waves
c
The trough of the sine curve used to represent a sound wave corresponds to a
a. compression.
b. region of high pressure.
c. point where molecules are pushed closer together.
d. rarefaction
d
Which of the following is the region of a sound wave in which the density and pressure are greater than normal?

a. rarefaction
b. compression
c. amplitude
d. wavelength
b
The highness or lowness of a sound is perceived as

a. compression
b. wavelength
c. ultrasound
d. pitch
d
Pitch depends on the __ of a sound wave.

a. frequency
b. amplitude
c. power
d. speed
a
In general, sound travels faster through

a. solids than through gases.
b. gases than through solids.
c. gases than through liquids.
d. empty space than through matter.
a
At a large distance from a sound source, spherical wave fronts are viewed as

a. wavelengths.
b. troughs.
c. rays.
d. plane waves.
d
The distance between wave fronts of plane waves corresponds to __ of a sound wave.

a. one wavelength
b. two amplitudes
c. one compression
d. one rarefaction
a
A train down the track toward an observer. The sounds from the train, as heard by he observer, is __ the sound heard by a passenger on the train.

a. the same as
b. a different timbre than
c. higher in pitch than
d. lower in pitch than
c
The doppler effect occurs with

a. only sound waves.
b. only transverse waves.
c. only water waves.
d. all waves.
d
The property of sound called intensity is proportional to the rate at which energy flows through

a. an area perpendicular to the direction of propagation
b. an area parallel to the direction of propagation.
c. a cylindrical tube.
d. a sound wave of a certain frequency.
a
The perceived loudness of a sound is measured in

a. hertz.
b. decibels.
c. watts.
d. watts per square meter.
b
Which of the following decibel levels is nearest to the value that you would expect for a running vacuum cleaner?

a. 10 dB
b. 30 dB
c. 70 dB
d. 120 dB
c
A sound twice the intensity of the faintest audible sound is not perceived as twice as loud because the sensation of loudness in human hearing

a. is approximately logarithmic.
b. is approximately exponential.
c. depends on the speed of sound.
d. is proportional to frequency.
a
When the frequency of a force applied to a system matches the natural frequency of vibration of the system, __ occurs.

a. damped vibration
b. random vibration
c. timbre
d. resonance
d
When an air column vibrates in a pipe that is open at both ends,
a. all harmonics are present.
b. no harmonics are present.
c. only odd harmonics are present.
d. only even harmonics are present.
a
when an air column vibrates in a pipe that is closed at one end,

a. all harmonics are present.
b. no harmonics are present.
c. only odd harmonics are present.
d. only even harmonics are present.
c
The wavelength of a fundamental frequency of a vibrating string of length L is

a. 1/2 L
b. L.
c. 2L.
d. 4L.
c
The quality of a musical tone of a certain pitch results from a combination of

a. fundamental frequencies.
b. harmonics.
c. transverse waves.
d. velocities.
b
Audible beats are formed by the interference of two waves

a. of slightly different frequencies
b. of greatly different frequencies
c. with equal frequencies, but travels in opposite directions.
d. from the same vibrating source.
a
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