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The wavelength of a certain electron transition in the hydrogen spectrum is 4864 A. Identify the transition.

1. Third line Balmer
2. First line Lyman
3. First line Paschen
4. second line Balmer

Correct answer: Third line Balmer

Solution

A wavelength of about 4864 Å lies in the visible Balmer series. In hydrogen, the third Balmer line corresponds to the transition from n=4 to n=2, which is the H-beta line near 4861 Å.

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