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The difference between the apparent freq...

The difference between the apparent frequency 71. of a source of sound as perceived by the observer during its approach and recession is 2% of the frequency of the source. If the speed of sound in air is `300 ms^(-1)` , then the velocity of the source is

A

`1.5 ms^(-1)`

B

`12 ms^(-1)`

C

`6 ms^(-1)`

D

`3 ms^(-1)`

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