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In constructive , a crest meets a crest or a trough meets a trough, resulting in a larger crest or trough

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In constructive , a crest meets a crest or a trough meets a trough, resulting in a larger crest or trough. Re-inforcement occurs and the resultant amplitude is the algebraic sum of each waves amplitude.

In destructive interference, a crest meets a trough and results in cancellation hence a smaller disturbance than either of the two interacting waves.