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If the minimum wavelength of the spectral line in the Lyman series for a hydrogen atom is X, what is the maximum wavelength of the spectral line in the Balmer series for a Li²⁺ ion?

1. 9X
2. X/9
3. 5X/4
4. 4X/5

Correct answer: 4X/5

Solution

The maximum wavelength of the spectral line in the Balmer series for a Li²⁺ ion is 4X/5, where X is the minimum wavelength of the spectral line in the Lyman series for a hydrogen atom, due to the specific energy level transitions in hydrogen-like atoms.

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