Concept information
Preferred term
Photons
Type
-
Topical Descriptor
Broader concept
Note
- elementary particles; IM
Scope note
- Discrete concentrations of energy, apparently massless elementary particles, that move at the speed of light. They are the unit or quantum of electromagnetic radiation. Photons are emitted when electrons move from one energy state to another. (From Hawley's Condensed Chemical Dictionary, 11th ed)
History note
- 94; was see RADIATION 1985-1993
URI
http://www.yso.fi/onto/mesh/D017785
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