Consider a photon of a continuous X-ray coming from a Coolidge tube. Its energy comes from

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the kinetic energy of the striking electron In an X-ray tube, electrons are emitted by the filament when it is heated. An electric field generated by a DC battery between the filament and the target makes the electrons hit the target atoms with a very high speed. As a result, the electrons lose their kinetic energy to eject photons, which leads to a continuous emission of X-rays.

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