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Two sound sources emitting sound each of...

Two sound sources emitting sound each of wavelength `lambda` are fixed at a given distance apart. A listener moves with a velocity `u` along the line joining the two suorces. The number of beats heard by him per second is

A

`v_0/lambda`

B

`2v_0 lambda`

C

`2v_0/ lambda`

D

`lambda/v_0`

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