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A source of sound attached to the bob of...

A source of sound attached to the bob of a simple pendulum execute `SHM` . The difference between the apparent frequency of sound as received by an observer during its approach and recession at the mean frequency of the source . The velocity of the source at the mean position is ( velocity of sound in the air is `340 m//s`)
[Assume velocity of sound `lt lt` velocity of sound in air ]

A

1.4 m/s

B

3.4 m/s

C

1.7 m/s

D

2.1 m/s

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The correct Answer is:
B
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