SELECT * FROM question_mgmt as q WHERE id=1278 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=43 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

What is the maximum number of emission lines when the excited electron of an H atom in n = 6 drops to the ground state?

Answer:

Number of lines produced when electron from nth shell drops to ground state = n(n-1)/2

Now according to question lines produced when electron drops from 6th shell to ground state

= 6(6-1) / 2 = 15

These are produced due to following transition

6 to 5      5 to 4    4 to 3     3to 2     2 to 1 (5 lines)

6 to 4     5 to 3    4 to 2     3 to 1             (4 lines)  

6 to 3     5 to 2    4 to 1                          (3 lines)

6 to 2     5 to 1                                      (2 lines)

6 to 1                                                    (1 lines)


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