Definition: Compton effect (A.H. Compton; 1923): An effect that demonstrates that photons (the quantum of electromagnetic radiation) have momentum. A photon fired at a stationary particle, such as an electron, will impart momentum to the electron and, since its energy has been decreased, will experience a corresponding decrease in frequency.
Compton effect (A.H. Compton; 1923)
From Nick Greene, former About.com Guide
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