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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

`(2u)/(lambda)`

B

`(u)/(lambda)`

C

`sqrt(ulambda)`

D

`(u)/(2lambda)`

Text Solution

Verified by Experts

The correct Answer is:
A
beats/sec `=f1-f2`
`=f[(V+V_(0))/(V)]-f[(V-V_(0))/(V)]`
`=(2fV_(0))/(V)=(2V_(0))/(lambda)`
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