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Trough (physics)

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Crest (physics)
A crest is the point on a wave with the maximum value or upward displacement within a cycle. A crest is a point on the wave where the displacement of the medium is at a maximum. A trough is the opposite of a crest, so the minimum or lowest point in a cycle. A point on the wave is a trough if the displacement of the medium at that point is at a minimum

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