Le site de vulgarisation scientifique de l’Université de Liège. ULg, Université de Liège
Wavelength

Spatial periodicity of the oscillations of an electromagnetic wave (distance between two oscillations). It is therefore also the distance travelled by a wave during an oscillation. It is expressed in metres and is inversely proportional to the frequency. The shorter the wavelength, the greater the intensity and the more energy it has: for instance, an x-ray has more energy than visible light.

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