Electromagnetic Wave

Electromagnetic waves (電磁波) are waves formed by changes in the electric and magnetic fields in space.

Overview

Electromagnetic waves (電磁波, denjiha), are waves of particles called photons.

They are classified according to their wavelength range, and light (visible light) that can be seen by humans is also a part of electromagnetic waves.

The longer the wavelength, the lower the frequency and the lower the energy per photon.

The speed at which electromagnetic waves travel (the speed of light) is about 300,000 km/second in a vacuum, which is very fast. The speed of light slows down in matter, and the degree of this slowness depends on the wavelength.

Classification

Radio Wave

夕方の電波望遠鏡と三日月by星海空Hoshiumisora

Electromagnetic wave with the longest wavelength. Used for communication. Divided into ultra-long wave, long wave, medium wave, short wave, and ultrashort wave according to frequency.