The Compton effect demonstrates that .....

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(D) The Compton effect is the scattering of a photon by a charged particle,usually an electron. It results in a decrease in energy (increase in wavele

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Photons have momentum.

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(D) The Compton effect is the scattering of a photon by a charged particle,usually an electron. It results in a decrease in energy (increase in wavelength) of the photon,which is called the Compton shift. This phenomenon cannot be explained by the classical wave theory of light. It can only be explained by treating light as a stream of particles (photons) that collide with electrons. In this collision,both energy and momentum are conserved. Therefore,the Compton effect provides direct evidence that photons possess momentum,confirming the particle nature of electromagnetic radiation.

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