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(C) In $X-$ray spectra, the emission consists of two parts: a continuous background and sharp peaks.The continuous background is due to Bremsstrahlung

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characteristic spectrum

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(C) In $X-$ray spectra, the emission consists of two parts: a continuous background and sharp peaks.The continuous background is due to Bremsstrahlung radiation, which occurs when electrons are decelerated by the target material.The sharp peaks, such as $A$ and $B$, occur at specific wavelengths that are unique to the target material used in the $X-$ray tube.These peaks arise from electronic transitions within the atoms of the target material, where an electron from a higher energy shell fills a vacancy in a lower energy shell.Therefore, these sharp peaks are referred to as the characteristic $X-$ray spectrum.

The figure represents the observed intensity of $X-$rays emitted by an $X-$ray tube as a function of wavelength. The sharp peaks $A$ and $B$ denote:

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