Wavelength (λ) is the distance between two consecutive corresponding points on a wave, such as two adjacent peaks or two adjacent troughs. It is one of the basic quantities describing a wave and is inversely related to frequency. For light, shorter wavelengths correspond to higher energy.

波长(λ)是波上两个相邻对应点之间的距离,如两个相邻波峰或两个相邻波谷之间的距离。它是描述波的基本量之一,与频率成反比。对于光,波长越短对应的能量越高。