NEET Physics Waves Questions Solved

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 

(1) 166 m/sec

(2) 664 m/sec

(3) 332 m/sec

(4) 1328 m/sec

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