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

1. A. 765 Hz
2. B. 800 Hz
3. C. 838 Hz
4. D. 885 Hz

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