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

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, f ( c - v ) c + v, f ( c + v ) c - v, f ( c + 2 v ) c + v, f ( c - v ) c - 2 v

MARKS App · Accepted Answer

In first case observer (surface) is moving away. perceiver frequency f ′ = f ( c − v c ) In second case source (surface) is moving away. Perceived frequency f ″ = f ′ ( c c + v ) = f ( c − v c + v )

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