the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330ms^−1)

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A siren emitting a sound of frequency 800Hz moves away from an observer towards a cliff at a speed of 15ms^−1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330ms^−1)
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A siren emitting a sound of frequency 800Hz moves away from an observer towards a cliff at a speed of 15ms^−1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330ms^−1) A siren emitting a sound of frequency 800Hz moves [...]
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