# PSC 2121 Lecture Notes - Lecture 5: Tuning Fork, Longitudinal Wave, Cool Air

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27 Apr 2016
School
Course
Physical Science PSC2121
1) What is the approximate distance of a thunderstorm when you note a 3s delay between the
flash of lightning and the sound of thunder ā (sound waves are an example of longitudinal waves)
a.
1020 m
b. 110 m
c.
673 m
d. None of these
2) The compression and the rarefaction travel in the same direction
a.
True
b. False
3) The sound travel faster in warm air than cool air.
a.
True
b. False
4) A tuning fork produces a sound with a frequency of 256 Hz and a wavelength in air of 1.33 m.
The speed of sound is
a.
123 m/s
b. 340 m/s
c.
457 m/s none of these
5) A mosquito flaps its wings at a rate of 600 vibrations/second. Given the speed of sound 340 m/s
how far does the sound travel between wings beats?
a.
0.56 m
b. 1440 m
c.
390 m
d. None of these
6) A bat flying in a cave emits sound and receive an echo 0.1 s later. Calculate the distance to the
wall of the cave
a.
17 m
b. 34 m
c.
68 m
d. None of these
7) If sound becomes louder which wave characteristic is likely increasing:
a.
Frequency
b. Wavelength
c.
Amplitude
d. Speed
8) A railroad locomotive is at rest and with its whistle shrieking and then it starts moving toward
you. The frequency of the sound you can hear
a.
Increases
b. Decreases
Page 1
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