Showing results for electromagnetic waves. Search instead for How+Are+Electromagnetic+Waves+Produced.

electromagnetic waves

Cultural

Waves composed of undulating electrical fields and magnetic fields. The different kinds of electromagnetic waves, such as light and radio waves, form the electromagnetic spectrum. All electromagnetic waves have the same speed in a vacuum, a speed expressed by the letter c (the speed of light) and equal to about 186,000 miles (or 300,000 kilometers) per second.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Lasers and radio are both invisible electromagnetic waves but lasers, usually ultraviolet light, offer cost, security and space-saving advantages.

From The Wall Street Journal • May 12, 2026

In 1886, the German physicist Heinrich Hertz demonstrated the existence of electromagnetic waves and discovered radio waves.

From The Wall Street Journal • Apr. 26, 2026

The technology can sift through vast quantities of data, including "satellite images, radar, electromagnetic waves, sound, drone images and sometimes real-time video," he added.

From Barron's • Mar. 7, 2026

Laser light differs from the light produced by bulbs or LEDs because its electromagnetic waves move in perfect sync.

From Science Daily • Dec. 23, 2025

So the Hab canvas shields from electromagnetic waves.

From "The Martian" by Andy Weir

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023