20. Which of the following properties of a wave on a string most affects the speed of the wave?
A) wave amplitude
B) string tension
C) wavelength
D) wave frequency
21.Alice is twice as far from a marching band as Bob. Alice hears the marching band at _______ intensity compared to Bob.
A) one half
B) the same
C) double
D) one quarter
22. Claire runs away from a stationary loudspeaker playing music, while Dennis stands still. The frequency of sound that Claire hears from the loudspeaker is _______ the frequency that Dennis hears.
A) greater than
B) less than
C) the same as
D) depends on speed
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