noun

photon

/ˈfoʊtɑn/ · say it: FOH·tahn

a particle of light

In Science & Nature

In more detail

1. (noun) a particle of light or other electromagnetic radiation

Examples

1. A photon is the smallest unit of light energy that can exist.

How to use photon

Photon is a technical term used primarily in physics, optics, and quantum mechanics to refer to the fundamental particle of electromagnetic radiation. It appears frequently in scientific contexts, academic writing, and technical discussions about light behavior and properties.

Common phrases

photon beam
photon energy
high-energy photon
photon emission
photon detector

Synonyms

light particle · quantum of light · electromagnetic quantum

Word family

photonic (adjective) · photonics (noun)

A common mistake

Learners sometimes treat photon as if it refers only to visible light, when it actually encompasses all electromagnetic radiation including radio waves, microwaves, ultraviolet, and X-rays.

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