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When an electron jumps from the fourth orbit to the second orbit, one gets the

1. second line of Lyman series
2. second line of Paschen series
3. second line of Balmer series
4. first line of Pfund series

Correct answer: second line of Balmer series

Solution

The Balmer series corresponds to electron transitions ending at the second orbit (n=2). The jump from the fourth orbit (n=4) to the second orbit (n=2) produces the second line of the Balmer series.

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