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in Physics by (106k points)

A stationary source emits sound of frequency f0 = 492 Hz. The sound is reflected by a large car approaching the source\ with a speed of 2 ms–1. The reflected signal is received by the source and superposed with the original. What will be the beat frequency of the resulting signal in Hz? (Given that the speed of sound in air is 330 ms–1 and the car reflects the sound at the frequency it has received).

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(6) Frequency perceived by reflector = f1 = 492 (332/330)
Frequency perceived by the source f2

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