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the entire spectrum, considered as a continuum, of all kinds of electric, magnetic, and visible radiation, from gamma rays having a wavelength of 0.001 angstrom to long waves having a wavelength of more than 1 million km.
the complete range of electromagnetic radiation from the longest radio waves (wavelength 105 metres) to the shortest gamma radiation (wavelength 10–13 metre)
electromagnetic spectrum

The entire range of electromagnetic radiation. At one end of the spectrum are gamma rays, which have the shortest wavelengths and high frequencies. At the other end are radio waves, which have the longest wavelengths and low frequencies. Visible light is near the center of the spectrum.

The family of electromagnetic waves. The electromagnetic spectrum, starting from the waves with the longest wavelengths (and least energy), consists of radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, x-rays, and gamma radiation. Members of the family differ from one another only in their wavelength, or frequency. For example, the wavelength of blue light is roughly half that of red light, but the waves corresponding to the two colors are otherwise identical.


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  • Electromagnetic-unit

    noun 1. a unit, as an abampere, in the system of units derived from the magnetic effects of an electric current. Abbreviation: emu, EMU. noun 1. any unit that belongs to a system of electrical cgs units in which the magnetic constant is given the value of unity and is taken as a pure number […]

  • Electromagnetic-wave

    noun, Physics. 1. a wave produced by the acceleration of an electric charge and propagated by the periodic variation of intensities of, usually, perpendicular electric and magnetic fields. noun 1. a wave of energy propagated in an electromagnetic field See also electromagnetic radiation electromagnetic wave A wave of energy consisting of electric and magnetic fields, […]

  • Electromagnetism

    [ih-lek-troh-mag-ni-tiz-uh m] /ɪˌlɛk troʊˈmæg nɪˌtɪz əm/ noun 1. the phenomena associated with electric and magnetic fields and their interactions with each other and with electric charges and currents. 2. Also, electromagnetics. the science that deals with these phenomena. /ɪˌlɛktrəʊˈmæɡnɪˌtɪzəm/ noun 1. magnetism produced by an electric current 2. Also called electromagnetics. the branch of physics […]

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