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Which of the following statements is true for Kα transition?

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Which of the following statements is true for Kα transition?

(a) It is singlet

(b) It is doublet

(c) It is triplet

(d) It is four let

The question was posed to me during an interview.

Question is taken from X-rays and their Generations in portion X-Ray Diffraction of Solid State Chemistry

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The correct choice is (b) It is doublet

Explanation: Kα is a transition from 2p→1s, and it is a doublet because the transition has slightly different energy for the two possible spin states of the 2p electron while makes the transition, relative to the spin of the vacant 1s orbital.

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