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(C) In $X-$ ray spectra,depending on the accelerating voltage and the target element,we may find sharp peaks superimposed on a continuous spectrum.The

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Characteristic radiations

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(C) In $X-$ ray spectra,depending on the accelerating voltage and the target element,we may find sharp peaks superimposed on a continuous spectrum.These sharp peaks occur at specific wavelengths that are unique to the target material used in the $X-$ ray tube.These peaks arise due to electronic transitions within the atoms of the target material,where an electron from a higher energy shell drops into a vacancy in a lower energy shell,emitting a photon of specific energy.Therefore,these peaks are known as characteristic radiations.

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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