What is the shortest wavelength line in the paschen series of Li2+ ion?

A
R/9
B
9/R
C
1/R
D
9R/4

Solution:

$\begin{array}{l} \frac{1}{λ} = {RZ}^{2} [\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}}] = R \times 3^{2} [\frac{1}{3^{2}} - \frac{1}{\infty^{2}}] \\ \Rightarrow R or λ = \frac{1}{R} \end{array}$

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What is the shortest wavelength line in the paschen series of Li²⁺ ion?

Solution:

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