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The wavelength of sound waves arriving a...

The wavelength of sound waves arriving at P from two coherent sources `S_1` and `S_2` is 4 m as shown. While intensity of each wave is `I_0` the resultant intensity at point P is `2I_0` find minimum value of x

A

`2(sqrt5-2)m`

B

`2(sqrt5-1)m`

C

`1/(sqrt+1) m`

D

`2(sqrt5+2)m`

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