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The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is:

1. 1
2. 4
3. 0.5
4. 2

Correct answer: 4

Solution

The last line of the Balmer series corresponds to the transition from n = ∞ to n = 2, and the last line of the Lyman series corresponds to the transition from n = ∞ to n = 1. Using the Rydberg formula, the ratio of their wavelengths is 4.

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