File:Sine_wavelength.svg · Wikimedia Commons · See Wikimedia Commons
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.]]
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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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).