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2 loudspeakers are emitting sound waves ...

2 loudspeakers are emitting sound waves of wavelength lambda with an initial phase difference of `pi/2` at what minimum distance from O on line AB will one hear a maximum

A

`25lambda`

B

`(100lambda)/(sqrt(15))`

C

`50 lambda`

D

`(25lambda)/(3)`

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The correct Answer is:
D
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