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The wavelength of the first line of Lyman series of hydrogen, $H e^{+} a n d L i^{2 +}$ ions are $λ_{1}, λ_{2} & λ_{3}$ respectively. The ratio of these wavelengths is

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1:4:9

9:4:1

36:9:4

6:3:2

answer is C.

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Detailed Solution

$\frac{1}{λ} = R Z^{2} (1 - \frac{1}{4})$ for lyman line.

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