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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

`(u)/(3lambda)`

D

`(2lambda)/`

Text Solution

Verified by Experts

The correct Answer is:
A
frequency heard by listener
`n_(1) = (v - u)/(V)(V)/(lambda) , n_(2) = (V + u)/(V)(V)/(lambda)`

beat frequency `= n_(2) - n_(1) = (2u)/(lambda)`
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RESONANCE ENGLISH-SOUND WAVES-Exercise- 2 PART - I
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