electromagnetic spectrum


electromagnetic spectrum

noun

Definition of ELECTROMAGNETIC SPECTRUM

:  the entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light

First Known Use of ELECTROMAGNETIC SPECTRUM

circa 1934

electromagnetic spectrum

noun    (Medical Dictionary)

Medical Definition of ELECTROMAGNETIC SPECTRUM

: the entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light

electromagnetic spectrum

noun    (Concise Encyclopedia)

The spectrum of electromagnetic waves ranges from low-frequency radio waves to high-frequency gamma …—© Merriam-Webster Inc.

Total range of frequencies or wavelengths of electromagnetic radiation. The spectrum ranges from waves of long wavelength (low frequency) to those of short wavelength (high frequency); it comprises, in order of increasing frequency (or decreasing wavelength): very-low-frequency to ultrahigh-frequency radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. In a vacuum, all waves of the electromagnetic spectrum travel at the same speed: 299,792,458 m/sec (186,282 mi/sec).

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