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A sound wave starting from source S, fol...

A sound wave starting from source `S`, follows two paths `AOB and ACB` to reach the detector `D`. If `ABC` is an equilateral traingle , of side `l` and there is silence at point `D`, the maximum wavelength `(lambda)` of sound wave must be

A

`l`

B

` 2 l`

C

` 3 l`

D

`4 l`

Text Solution

Verified by Experts

The correct Answer is:
B
Path difference ` = ( 2l - l) = lambda//2` (for minimum)
` lambda = 2 l`
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