A siren emitting a sound of \( 1 \mathrm{kHz} \) moves away from a stationary observer towards a...

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A siren emitting a sound of \( 1 \mathrm{kHz} \) moves away from a stationary observer towards a cliff at a speed of \( 10 \mathrm{~m} / \mathrm{s} \). Calculate the frequency of the sound echoed off the cliff (speed of sound \( =330 \mathrm{~m} / \mathrm{s} \) ). Will there be any beat frequency? Will there be any beats heard by a man?
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