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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 $ms^{-1}$)
A
800 Hz
B
838 Hz
C
885 Hz
D
765 Hz
Detailed Solution
'Out of Syllabus'