A stationary source emits sound of frequency f₀ = 492 Hz. The sound is ????????????????????c???????????? by a large car
????pp????o????c???????????????? the source with a speed of 2 ms⁻¹. The reflected signal is received by the soruce 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 ???????? has received).
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sorry can't understand the question .
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