1.

A Siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s, frequency of the sound to be heard by the listener is (take velocity of sound as 330 m/s) [CPMT 1996; AIIMS 2002; Pb. PMT 2001]

A.            733.3 Hz                                 
B.            644.8 Hz
C.            481.2 Hz                                 
D.            286.5 Hz
Answer» B.            644.8 Hz


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