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Three waves of same intensity (I0) havin...

Three waves of same intensity `(I_0)` having initial phases ` 0, pi/4 , - pi/4 ` rad respectively interfere at a point. Find the resultant Intensity

A

`5.8 I_(0)`

B

`0.2 I_(0)`

C

`3 I_(0)`

D

`I_(0)`

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