# The maximum number of emission lines when the excited electron of an H atom in n=5 drops to the ground state? Option 1) 15 Option 2) 10 Option 3) 20 Option 4) 5

As learnt in

Paschen , Bracket and Pfund Series spectrums -

Infrared Region

-

Each different transition of the electron results in a different emission line. So, as far the figure 5

The figure contains all possible transitions.

$\therefore$ possible emission lines (max.) = 10

Option 1)

15

This solution is incorrect.

Option 2)

10

This solution is correct.

Option 3)

20

This solution is incorrect.

Option 4)

5

This solution is incorrect.

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