Please answer the following question (MORE THAN ONE OPTIONS ARE CORRECT):

In a H-like sample, electrons make transition from 4th excited state upto 2nd state. Then:
(A) 10 different spectral lines are observed
(B) 6 different spectral lines are observed
(C) number of lines belonging to the balmer series is 3
(D) Number of lines belonging to paschen series is 2.
 

Dear student, There are 3 spectral line in this transition. Balmer series involves transition to n= 2. But here n=2 is not involved. Only option D is correct. Regards!

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