JEE Main 2013 Physics question

A 12.5eV electron beam is used to bombard gaseous hydrogen at room temperature. It will emit:

(1)2 lines in the Lyman series and 1 line in the Balmar seriesCorrect
(2)3 lines in the Lyman series
(3)1 line in the Lyman series and 2 lines in the Balmar series
(4)3 lines in the Balmer series

Answer: (1)

Solution

From the ground state, 12.5 eV can excite the atom at most to the level with , i.e. n = 3 (needs 12.09 eV). From n = 3 the possible transitions are 3→1 and 2→1

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Question ID VK-104192