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A siren emitting a sound of frequency 1000 Hz moves towards you, and away from a...

A siren emitting a sound of frequency 1000 Hz moves towards you, and away from a cliff at a speed of 25 m/s. a) what is the frequency of sound you heard coming directly to you from the siren? B) what is the frequency of sound you hear reflected from the cliff? (speed of sound = 340 m/s).

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