question_answer

For the production of characteristic\[kr-x-\]ray the electron transition is

A)  \[n=4\]to \[n=1\]       

B) \[n=3\]to\[n=1\]

C)  \[n=3\]to \[n=2\]      

D) \[n=2\]to\[n=1\]

Correct Answer: A

Solution :

 Electron transitions to lower atomic levels in heavy atoms have quantum energies which place them in the X-ray region of the electromagnetic spectrum. The X-ray emission associated with these transitions are characteristic X-rays. As it is clear from the diagram\[{{k}_{r}}\]is from\[n=4\]to\[n=1\].