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A stationary source emits a sound of frequency f 0 = 492 hz. The sound is reflected by a large car approaching the source with

A stationary source emits a sound of frequency f0 = 492 hz. The sound is reflected by a large car approaching the source with a speed of 2m/s. 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 m/s and the car reflects the sound at the frequency it has received).

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