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A siren emiting a sound of frequency 800...

A siren emiting a sound of frequency 800 Hz moves away from on obsever 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 m Velocity of sound in air `= 330 ms^(-1)`)

A

885 Hz

B

765Hz

C

800 Hz

D

838 Hz

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The correct Answer is:
D
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