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(D) The continuous $X$-ray spectrum is produced when a high-speed electron (often called a projectile or incident electron) is decelerated by the elec

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inverse photoelectric effect

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(D) The continuous $X$-ray spectrum is produced when a high-speed electron (often called a projectile or incident electron) is decelerated by the electric field of a target atom's nucleus. This process is known as Bremsstrahlung or braking radiation.During this interaction,the electron loses kinetic energy,which is emitted in the form of an $X$-ray photon. The energy of the emitted photon is given by $\Delta K = hf$,where $\Delta K$ is the change in kinetic energy of the electron.This process is essentially the inverse of the photoelectric effect. In the photoelectric effect,a photon is absorbed to eject an electron from a material. In the production of continuous $X$-rays,an electron is decelerated to emit a photon. Therefore,it is referred to as the inverse photoelectric effect.

The continuous part of $X$-ray spectrum is a result of the

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