The wavelength sequence of red, orange, yellow, green, cyan, blue and purple is: red, orange, yellow, green, cyan, blue and purple. Electromagnetic waves with a wavelength of 380-780 nm are visible light. Among them, the wavelength of red light is the longest, the wavelength of purple light is the shortest, and the wavelengths of other colors are in between. There are infrared and radio waves whose wavelength is longer than red light (>: 0.76 micron); Light waves are shorter than violet light.

Extended data:

The wavelength range of visible light is between 770 and 350 nanometers. Electromagnetic waves with different wavelengths make human eyes feel different colors.

770 ~ 622 nm, feeling reddish; 622 ~ 597 nm, orange; 597 ~ 577 nm, yellow; 577 ~ 492 nm, green; 492 ~ 480, cyan; 480 ~ 455 nm, indigo blue; 455 ~ 350 nm, purple.

Light waves are produced by the movement of electrons inside atoms. The movement of electrons inside atoms of various substances is different, so the light waves emitted are also different. It is of great theoretical and practical significance to study the light emission and absorption of different substances, and it has become a special subject-spectroscopy. The infrared absorption spectrum of molecules is generally to study the vibration spectrum and rotation spectrum of molecules, in which the molecular vibration spectrum has always been the main research topic.