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Light waves from two coherent sources su...

Light waves from two coherent sources superimpose at a point. The waves, at this point, can be expressed as `y_(1) = a sin [10^(15) pi t]` and `y_(2)a sin [10^(15) pi t + phi]`. Find the resultant amplitude if phase difference `phi` is
(a) zero
(b) `pi//3`
(c) `pi`
Also find the frequency (Hz) of resultant wave in each case.

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