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The difference between the apparent freq...

The difference between the apparent frequency of a source of sound as perceived by the observer during its approach and recession is 2% of the natural frequency of the source. If the velocity of sound in air is 300 m/s, the velocity of the source is

A

1.5 m/s

B

12 m/s

C

6 m/s

D

3 m/s

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