Two waves of equal amplitude and frequency interfere each other. The ratio of intensity when the...

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Two waves of equal amplitude and frequency interfere each other. The ratio of intensity when the two waves arrive in phase to that when they arrive \( 90^{\circ} \) out of phase is
(A) \( 1: 1 \)
(B) \( 2: 1 \)
(C) \( \sqrt{2}: 1 \)
(D) \( 4: 1 \)
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