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Sound waves of wavelength lambda travell...

Sound waves of wavelength `lambda` travelling in a medium with a speed of `upsilon m//s` enter into another medium where its speed is `2upsilon m//s.` Wavelength of sound waves iin the second medium is

A

`lambda`

B

`(lambda)/(2)`

C

` 2lambda`

D

`4lambda`

Text Solution

Verified by Experts

The correct Answer is:
C
Let the frequency in the first medium is v and in the second medium is v'
So, `" " v=v'rArr(v)/(lambda)=(v')/(lambda')`
`rArr" " lambda'=((v')/(v))lambda`
`lambda and lambda',` v and v' are wavelength and speeds in the first and second medium respectively.
So, `" " lambda'=((2v)/(v))lambda=2lambda`
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