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Two monochromatic light waves of amplitu...

Two monochromatic light waves of amplitudes 3A and 2A interfering at a point have a phase difference of `60^(@)` .The intensity at that point will be proportional to

A

`19 A^2`

B

`7 A^2`

C

`13 A^2`

D

`5 A^2`.

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