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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

`(u)/(2lambda)`

B

`(2u)/(lambda)`

C

`(u)/(lambda)`

D

`(u)/(3lambda)`

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