Britannica Sources used in this answer

Why do higher-frequency light waves carry more energy?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

A circular RYB color wheel divided into twelve segments, showing a progression of colors from red, orange, and yellow to green, blue, and violet. — colour The RYB color model is being illustrated on a color wheel.

In the context of optics, higher-frequency light waves carry more energy because the energy of a photon—the fundamental packet of electromagnetic radiation—is directly proportional to its frequency.12

This relationship is defined by the equation:
$E = h ν$

In this formula:
* $E$ represents the energy of the photon.1
* $h$ is Planck’s constant, a fundamental physical constant.13
* $ν$ (the Greek letter nu) represents the frequency of the electromagnetic wave.1

Because $h$ is a constant, as the frequency ( $ν$ ) of the light increases, the energy ( $E$ ) of each individual photon must also increase. Consequently, radiation with higher frequencies—such as ultraviolet light, X-rays, and gamma rays—possesses significantly more energy per photon than lower-frequency radiation like infrared or radio waves.214