A) Energy of projectile electron
B) thermal energy of target
C) transition in target atoms
D) none of the above
Correct Answer: C
Solution :It was found that when voltage applied to X-ray tube is changed, positions of spectral lines remain unchanged. However, when a different material is used as a target in X-ray tube, an entirely different set of spectral lines is obtained. Thus, the energy of characteristic X-ray is a consequence of transition in target atoms.
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