Two interfering waves of the same frequency have \( \mathrm{P} \) a...

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Two interfering waves of the same frequency have
\( \mathrm{P} \) amplitudes in the ratio \( 1: 3 \), . If the intensity of the

W first wave, is I, the intensity at the minima is
(1) zero
(2) 2 I
(3) \( 4 \mathrm{I} \)
(4) \( 8 \mathrm{I} \)
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