Wavelength

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Wavelength

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In general, the mean distance between maximums (or minimums) of a roughly periodic pattern. Specifically, the least distance between particles moving in the same phase of oscillation in a wave disturbance. </dd>
The wavelength is measured along the direction of propagation of the wave, usually from the midpoint of a crest (or trough) to the midpoint of the next adjoining crest (or trough). It is related to frequency f and phase speed v by λ = v / f , where λ is wavelength. The reciprocal of wavelength is the wave number. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use