A siren emitting a sound of frequency $800\,\, Hz$ moves away from an observer towards a cliff at a speed of $15 \,\,m s^{-1}$. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is .... $Hz$
(Take velocity of sound in air $= 330\,\, m s^{-1}$)
(Take velocity of sound in air $= 330\,\, m s^{-1}$)
NEET 2016, Medium
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