Scattering in the Compton Effect
The Compton Effect is the name given to the scattering of a photon by an electron. Energy and momentum are conserved, resulting in a reduction of both for the scattered photon. Studying this effect, Compton verified that photons have momentum.
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"OpenStax College, Photon Momentum. January 28, 2013."
http://cnx.org/content/m42568/latest/
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