for destructive interference the phase difference between two waves should be.
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Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is cancelled exactly by a negative displacement of the other wave. The amplitude of the resulting wave is zero. ... In the image on the left, the phase difference is δ = π/2 or 90 degrees.
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Even integeal multiple of πor 180°
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