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Will the motion of water in which the wave propagate change the frequency of wave

by gstar2002
Tags: frequency, motion, propagate, water, wave
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gstar2002
#1
Oct17-10, 10:50 PM
P: 3
i know that motion of source can change the frequency of wave.
constant speed motion will not change the wave progagation relative to water itself.but from the point of a observer at speed 0, the propagation speed will change. so my question is what will happen to frequency?
thanks for help. maybe the motion is then not wave.
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hikaru1221
#2
Oct17-10, 11:07 PM
P: 799
Suppose that the source doesn't move. In T, the source emits a full wavelength d = vT, where v is the propagation speed in moving medium. The wave front approaches the observer with speed v. So to pass the observer a distance d (= 1 wavelength), it takes time = d/v = T. So nothing changes The result is not surprising, as Doppler effect has nothing to do with propagation speed in the medium.


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