1.

An observer moves towards a stationary source of sound of frequency n. The apparent frequency heard by him is 2n. If the velocity of sound in air is 332 m/sec, then the velocity of the observer is                                    [MP PET 1990]

A.            166 m/sec                              
B.            664 m/sec
C.            332 m/sec                              
D.            1328 m/sec
Answer» D.            1328 m/sec


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