Doppler effect, source and receiver in different media

AI Thread Summary
To calculate the frequency of a sound wave received by a helicopter from a submarine, one must consider the Doppler effect while accounting for the change in wave speed as the sound transitions between water and air. The frequency emitted by the submarine remains constant, but the speed of sound differs in each medium, affecting the observed frequency. The Doppler shift formulas can still be applied by using the appropriate speed of sound for each medium when calculating the frequency. It is essential to apply the correct parameters for both the submarine and helicopter's motion relative to the sound wave. Understanding these principles allows for accurate frequency calculations despite the change in media.
nikolafmf
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Hello,

For convenience, we can say that a submarine at some depth in sea emits sound wave which refracts from the surface of the sea and is caught by a helicopter at some height above the sea. If we know the speeds of the submarine and the helicopter and the frequency of the emitted wave (and, of course, the speed of the sound in water and air), how are we going to calculate the frequency of the received wave? I know how to use the Doppler shift's formulas when the wave travels all the time in a same media. But, when it changes media, it also changes its speed. How can we account for that?


Nikola
 
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Frequency is not afected by passing between media.
 
A.T. said:
Frequency is not afected by passing between media.

Yes, I know that. But in the formula for Doppler effect, wave speed occurs, as in the first formula here: http://en.wikipedia.org/wiki/Doppler_effect#General. And speed do changes by passing between media. So, how can I calculate received frequency?
 
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