electromagnetic spectrum

electromagnetic spectrum


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).

This entry comes from Encyclopædia Britannica Concise.
For the full entry on electromagnetic spectrum, visit Britannica.com.

Seen & Heard

What made you look up electromagnetic spectrum? Please tell us what you were reading, watching or discussing that led you here.

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More