Question 15
What is the maximum number of emission lines when the excited electron of an H atom in n = 6 drops to the ground state?
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)
