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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 sources. The number of beats heard by him per second is

A

`(2u)/(lambda)`

B

`(u)/(lambda) `

C

`sqrt(u lambda) `

D

`(u)/(2 lambda )`

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The correct Answer is:
A
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