Jump to content

Crest and trough

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by ClueBot NG (talk | contribs) at 22:02, 6 December 2023 (Reverting possible vandalism by 92.25.17.14 to version by Entranced98. Report False Positive? Thanks, ClueBot NG. (4287663) (Bot)). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Crest and trough in a wave

A crest point on a wave is the maximum value of upward displacement within a cycle. A crest is a point on a surface 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.

When the crests and troughs of two sine waves of equal amplitude and frequency intersect or collide, while being in phase with each other, the result is called constructive interference and the magnitudes double (above and below the line). When in antiphase – 180° out of phase – the result is destructive interference: the resulting wave is the undisturbed line having zero amplitude.

See also

References

  • Kinsman, Blair (1984), Wind Waves: Their Generation and Propagation on the Ocean Surface, Dover Publications, ISBN 0-486-49511-6, 704 pages.