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Preferred Term:

photons

Definition:
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.
Concept Schemes:
NALT Full
Broader Concept:
URI:
https://lod.nal.usda.gov/nalt/273158
Download this Concept:
RDF/XMLCreated 2016-02-25, last modified 2018-04-03