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MHT CET 2025 (20 Apr, Shift 1) · Hydrogen Spectrum & Spectral Series

Hydrogen Spectrum & Spectral Series question from MHT CET 2025 (20 Apr, Shift 1)

Q9MHT CET 2025 · 20 APR · SHIFT 1Easy

Hydrogen Spectrum & Spectral Series

In hydrogen spectrum, the ratio of wavelengths of the last line of Lyman series and that of the last line of Balmer series is

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Answer: (c)

Last line = series limit: $\lambda = \frac{n_1^2}{R}$ .
Lyman: $\frac{1}{R}$ ; Balmer: $\frac{4}{R}$ .
Ratio $= \frac{1}{4} = 0.25$ .
So the answer is (c) 0.25.

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