Atomic StructureHard

Question

Rydberg given the equation for all visible radiation in the hydrogen spectrum as $\lambda = \frac{kn^{2}}{n^{2} - 4}$. The value of k in terms of Rydberg constant is

Options

A.4R
B.R/4
C.4/R
D.R

Solution

$\frac{1}{\lambda} = R \times 1^{2}\left( \frac{1}{2^{2}} - \frac{1}{n^{2}} \right) = \frac{R.\left( n^{2} - 4 \right)}{4n^{2}}$

$\therefore\lambda = \frac{4n^{2}}{R\left( n^{2} - 4 \right)} = \frac{K.n^{2}}{n^{2} - 4} \Rightarrow K = \frac{4}{R}$

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