radiation consisting of self-sustaining oscillating electric and magnetic fields at right angles to each other and to the direction of propagation. It does not require a supporting medium and travels through empty space at the speed of light
See also photon
WordReference Random House Unabridged Dictionary of American English © 2025
electromagnet′ic radia′tion, [Physics.]
- Physicsradiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x-rays, and gamma rays.
- 1950–55
Collins Concise English Dictionary © HarperCollins Publishers::
'electromagnetic radiation' also found in these entries (note: many are not synonyms or translations):
Compton effect
- Doppler effect
- Langley
- MPR II
- Planck's radiation law
- absorption coefficient
- absorption spectrum
- annihilation
- annihilation radiation
- atmospheric window
- beam
- black body
- black hole
- black light
- blackbody
- c
- cosmic background radiation
- dark matter
- diathermancy
- diffusion
- dispersion
- electromagnetic
- electromagnetic spectrum
- electromagnetic wave
- electron spin resonance
- emission spectrum
- ether
- event horizon
- focus
- gamma radiation
- gamma ray
- gravitational redshift
- image converter
- infrared
- irradiate
- jansky
- laser
- lens
- light
- microwave
- microwave background
- monochromatic
- nuclear magnetic resonance
- phosphor
- photocell
- photoconductivity
- photoelectric
- photoelectric effect
- photoelectricity
- photoemission