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Hydrogen Spectrum & Spectral Series question from NEET 2017

Q54NEET 2017Easy

Hydrogen Spectrum & Spectral Series

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

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Answer: (b)

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

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