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Photon
VocabularyA quantum of the electromagnetic field.
Explanation or usage
A photon is an electrically neutral elementary particle associated with electromagnetic radiation. It has zero rest mass.
In The Feynman Lectures on Physics, Volume I
General context reviewed · book attribution and sources pending
This entry is associated with the book; no specific chapter or section attribution is asserted.
In QED: The Strange Theory of Light and Matter
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General illustrative particle context; no claim about a specific passage or edition.