c. transmitting electrical power and using it to produce sound similar to the speaker's voice.
d. concentrating the power of the sound waves and transmitting this power to a distant receiver.
2. Sound waves are transmitted through a medium.
The property of a medium that determines its
effectiveness as a medium is its
a. mass.
c. flexibility.
b. density.
d. cross section.
3. Terms such as frequency, velocity, amplitude, period, pitch, quality, and wavelength are used to describe
sound waves. The term that is used to express the relative compression of the air particles is called the
a. velocity.
c. frequency.
b. amplitude.
d. wavelength.
4. The velocity of sound waves varies with the transmission medium. The medium through which sound
travels at the fastest rate is
a. air.
c. solids.
b. water.
d. a vacuum.
5. The flash of a cannon is seen 7 seconds before the report of the gun is heard. The distance from the
observer to the gun is approximately
a. 1 mile.
c. 2-1/2 miles.
b. 1-1/2 miles.
d. 4-1/2 miles..
6. The component of a sound wave that enables us to distinguish between speakers who pronounce the same
word is the
a. pitch.
c. amplitude.
b. velocity.
d. harmonics.
7. Sound waves cover a wide range of frequencies, but the human ear does not respond to all of these
frequencies. The frequency of the audible range of sound for the average person is approximately
a. 5 to 5,000 hertz.
c. 200 to 5,000 hertz.
b. 100 to 300 hertz.
d. 20 to 20,000 hertz.
8. A musical note is given quality by the harmonics, or overtones, which it contains. The frequency of the
fourth harmonic of the note middle C is
410 L1
4
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