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thumb|right|The wavelength of a sine wave, λ, can be measured between any two points with the same phase, such as between crests (on top), or troughs (on bottom), or corresponding [[zero crossings as shown.]]

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Wavelength is the distance between two identical points on a repeating wave, such as from one crest to the next crest. It matters because wavelength is a fundamental way to describe and measure waves, which are everywhere in nature—from light and sound to radio signals and water ripples.

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Wikidata facts

Subclass of: distance
Image: Local wavelength.svg

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Commons category: Wavelength
recommended unit of measurement: metre
notation: Λ
on focus list of Wikimedia project: Wikipedia:Vital articles/Level/4
Stack Exchange tag: physics.stackexchange.com/tags/wavelength

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