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Peter Debye, Arthur Holly Compton, 1923: scattering of x-rays photons from electrons could be explained by treating photons as paparticlesrticles wwithith eenergynergy hf aandnd mmomentumomentum hf/c aandnd by conserving energy and momentum of the photon-electron pair in a collision pppp garticle properties of light x-rays – are electromagnetic
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