Text: "What are photons and electrons?" The nature of a photon is an unresolved problem. Two not very satisfying models describe different aspects of their behavior; they disperse in a wavelike manner but they deliver energy and momentum at a point. Writing in response to H. L. Armstrong, American Journal of Physics. 51, 103 (1983). Letter to the editor. American Journal of Physics. 52(1), Jan. 1984. p. 11.

See Also: photons, electrons, foundations of physics, electromagnetic fields, field theory.

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