Physics Principles and Problems 2009

Section 15.1 : Properties and Detection of Sound

Self-Check Quizzes

1
Why can't sound waves travel in a vacuum?
A)The pressure is too low in a vacuum.
B)The vibrations would not be detected.
C)The temperature cannot be raised high enough.
D)There are no particles to collide.
2
What are sound pressure waves converted to by the human ear?
A)sound energy
B)brain vibrations
C)electrical impulses
D)It is still unknown.
3
Sound level is a measure of _____.
A)frequency
B)amplitude
C)wavelength
D)pitch
4
Due to the Doppler effect, the _____ of a sound increases as the source approaches you.
A)amplitude
B)speed
C)wavelength
D)sound level
5
In the equation for the Doppler effect, what does vs = 0 mean?
  Need a Hint?
A)stationary detector, source in motion
B)stationary source, detector in motion
C)stationary source and detector
D)moving source and detector
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