4.
If you are talking over the telephone system (refer to chapter 1, paragraph 6b and the formula), and the sound
wave of your voice is traveling at a velocity of 1,130 feet per second toward the transmitter, what will be the wavelength
of the frequency 500 hertz?
a.
2.26 feet.
c.
22.6 feet.
b.
.442 feet.
d.
44.2 feet.
5.
The waveforms in figure 5 show the pattern of waves which were produced by different sounds. The component
of sound waves that enables us to distinguish between different speakers who pronounce the same word is the:
a.
pitch.
c.
amplitude.
b.
velocity.
d.
6.
Assume that during an analytic study you discovered that sound waves cover a wide range of frequencies, and that
the average human ear cannot respond to all. To what frequency range does the average human ear normally respond?
a.
10 to 300 hertz.
b.
20 to 20,000 hertz.
c.
10 to 3,000 kilohertz.
d.
20 to 200 kilohertz.
7.
As stated in paragraph 8a of chapter 1, the fundamental frequency of middle "C" is 256 cps. What then is the
frequency of the fourth harmonic of middle C?
a.
640 hertz.
c.
640 kilohertz.
b.
1,024 hertz.
d.
1,024 kilohertz.
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