What is the wave number of the radiation of lowest frequency in the Lyman series of the spectrum of

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What is the wave number of the radiation of lowest frequency in the Lyman series of the spectrum of Li2+ ion?

Accepted Answer

For lowest frequency in Lyman series, the transition is 2 → 1.

$\bar{\upsilon} = Rz^{2}\left( \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}} = R \times 3^{2} \right)\left( \frac{1}{1^{2}} - \frac{1}{2^{2}} \right) = \frac{27R}{4}$

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