Electromagnetic Spectrum
Astronomy
The entire range of wavelengths of electromagnetic energy, including (from short to long wavelengths) gamma rays, X rays, ultraviolet light, visible light, infrared, and radio waves.
- — NASA Helioviewer.org Visual Glossary retrieved 2014-05-26
The entire range of all the various kinds or wavelengths of electromagnetic radiation or light, including (from long to short wavelengths): radio, infrared, visible, ultraviolet, X-rays and gamma rays.
- — Space Weather Center Glossary of Space Weather-Related Terms retrieved 2014-05-26
Defense
The range of frequencies of electromagnetic radiation from zero to infinity. It is divided into 26 alphabetically designated bands. 91
Telecommunications
The range of frequencies of electromagnetic radiation from zero to infinity. Note: The electromagnetic spectrum was, by custom and practice, formerly divided into 26 alphabetically designated bands. This usage still prevails to some degree. However, the ITU formally recognizes 12 bands, from 30 Hz to 3000 GHz. New bands, from 3 THz to 3000 THz, are under active consideration for recognition. Refer to the figure below.
