A siren emitting sound of frequency 800Hz is going away from a static – McqOptions

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1.	A siren emitting sound of frequency 800Hz is going away from a static listener with a speed of 30m/s. Frequency of the sound to be heard by the listener is (Take velocity of sound as 330m/s).
A.	733.3Hz
B.	644.8Hz
C.	481.2Hz
D.	286.5Hz
Answer» B. 644.8Hz

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