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Class 11 NEET Physics Waves Questions Questions

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Question : 21 of 96

Marks: +1, -0

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of

15\,\text{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\,\text{ms}^{-1}

885 Hz
765 Hz
800 Hz
838 Hz

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