A sound wave of frequency f propagating through the air with a velocity c , is reflected from a wall which is moving away from the stationary source with a constant speed v . The frequency of the refl

Question

A sound wave of frequency f propagating through the air with a velocity c , is reflected from a wall which is moving away from the stationary source with a constant speed v . The frequency of the reflected wave, measured by the observer at the position of the source is

TestHub · Accepted Answer

In first case observer (surface) is moving away. perceiver frequency

$f^{'} = f (\frac{c - v}{c})$

In second case source (surface) is moving away. Perceived frequency

$f^{″} = f^{'} (\frac{c}{c + v}) = f (\frac{c - v}{c + v})$

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