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Photon

UK //ˈfəʊtən//US //ˈfoʊtɒn//

Definition

A particle representing a quantum of light.

In simple words: A tiny particle of light or electromagnetic radiation.

Examples

A photon can travel through a vacuum at the speed of light.
Photons are emitted when atoms transition to a lower energy state.
The behavior of a photon can be described using quantum mechanics.
Scientists are researching how to capture photons for energy.
Each photon carries a specific amount of energy related to its frequency.

Usage notes

Used mostly in scientific contexts. Not commonly used in everyday conversation. Appropriate in academic or technical discussions about physics.

Grammar pattern

standalone noun

Memory hint

Think of 'photo' plus 'on', like light is always 'on'.

Collocations

photon energy
photon emission
photon interaction

Synonyms

light particle
quantum of light
electromagnetic wave

Common mistakes

Confused with 'photonics', which is the study of photons.
Mispronounced as 'photoon' instead of 'foton'.