Waves from two sources of intensities I and \( 4 \mathrm{I} \) \( \...

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Waves from two sources of intensities I and \( 4 \mathrm{I} \)
\( \mathrm{P} \) interfere at a point. The resultant intensity at a point

W where the phase difference is \( \pi / 2 \) is
(1) \( 9 \mathrm{I} \)
(2) 5 I
(3) 3 I
(4) I
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