wavelength

The colour of visible light is determined by its wavelength, with violet having the shortest and red the longest.可见光的颜色由其波长决定，其中紫光波长最短，红光波长最长。

Radio telescopes detect electromagnetic radiation at wavelengths far longer than those visible to the human eye.射电望远镜探测到的电磁辐射波长远比人眼可见的波长要长。