+Wavelength is the spatial period of a [Wave](/wiki/wave), the distance over which a wave's shape repeats. It is typically measured from one crest to the next, or one trough to the next, and is inversely related to [Frequency](/wiki/frequency), defining how energy propagates.
+## See also
+- [Light](/wiki/light)
+- [Sound](/wiki/sound)
+- [Spectrum](/wiki/spectrum)
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