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m →Introduction: Removed sentence fragment explaining (redundantly and in direct contradiction to the first sentence of the introduction) that Compton scattering is an example of elastic scattering, unused </ref> tag, and another strange, uncited sentence fragment about differing understandings of the elasticity of Compton scattering within different fields.
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[[File:Compton-en.svg|thumb|right|Fig. 1: Schematic diagram of Compton's experiment. Compton scattering occurs in the [[graphite]] target on the left. The slit passes X-ray photons scattered at a selected angle. The energy of a scattered photon is measured using [[Bragg scattering]] in the crystal on the right in conjunction with ionization chamber; the chamber could measure total energy deposited over time, not the energy of single scattered photons.]]
Compton scattering is an example of [[inelastic scattering]]. The incident photon loses energy in the lab frame, which centuries of practice had identified with inelastic scattering—even though, in the c.m. frame, the respective masses remaining the same, no new species are created and kinetic energy is conserved, the mark of an ''elastic collision''
The effect is significant because it demonstrates that light cannot be explained purely as a [[wave]] phenomenon.<ref>{{cite book
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