All forms of electromagnetic radiation, whether they're called waves or rays, are generated by particles in motion. In a radio signal, for example, negatively charged electrons quickly move back ...

“Electromagnetism” is a silent educational film from the late 1920s that explains the basic principles of electromagnetism using simple animations, diagrams, and live-action demonstrations.

Electromagnetic waves travel at 300,000,000 ... Each group contains a range of frequencies. For example, visible light contains the limited range of frequencies that can be detected by the human ...

Electromagnetic waves can be separated into seven distinct groups in the spectrum. Each group contains a range of frequencies. For example, visible light contains all the frequencies that can be ...