Crest and trough - Wikipedia Crest and trough A crest is the point on a wave with 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. Interference 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 Crest factor Superposition principle Wave References Kinsman, Blair ( 1984 ), Wind Waves : Their Generation and Propagation on the Ocean Surface, Dover Publications, ISBN 0 - 486 - 49511 - 6, 704 pages. This physics - related article is a stub. You can help Wikipedia by expanding it. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Crest_and_trough&oldid=830398553 '' Categories : Waves Physics stubs Talk About Wikipedia Català Español فارسی Gàidhlig Kreyòl ayisyen Norsk Simple English 中文 Edit links This page was last edited on 14 March 2018, at 15 : 54. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: it is the point on a wave with the maximum value or upward displacement within a cycle
Answer: crest