NEET Physics Waves Questions Solved

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An observer is moving away from source of sound of frequency 100 Hz. His speed is 33 m/s. If speed of sound is 330 m/s, then the observed frequency is 

(1) 90 Hz

(2) 100 Hz

(3) 91 Hz

(4) 110 Hz

(1) n'=nvvOv=33033330×100=90 Hz

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