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A sound wave of wavelength 32 cm enters ...

A sound wave of wavelength 32 cm enters the tube at S as shown in the figure. Then the smallest radius r so that a minimum of sound is heard at detector D is

A

`7cm`

B

`14cm`

C

`21cm`

D

`28cm`

Text Solution

Verified by Experts

The correct Answer is:
D
Path difference `Deltax=nlambda` for maximum
`n=1` for `r=` going to be least `:.pi-2r=lambda`
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