# will the motion of water in which the wave propagate change the frequency of wave

by gstar2002
Tags: frequency, motion, propagate, water, wave
 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.
 P: 802 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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