(quantum mechanics) A theory of photoemission developed by Einstein, according to which a light beam behaves like a stream of particles (called photons) when it delivers energy to a substance displaying photoemission, the particles each having an energy equal to Planck's constant times the frequency of the light.
photon theory
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(′fō′tän ′thē·ə·rē)
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 | corpuscle |
| Compton effect (in physics) |
| Augustin Jean Fresnel |
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