Question

The first emission line in the Balmer series in the atomic spectrum of hydrogen appears at

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

First line in Balmer series occurs when a transition from $n_1=2to{n}_2=3$ takes place.
$\frac{1}{\lambda }=\overline{v}=R{Z}^2[\frac{1}{n_1^2}-\frac{1}{n_2^2}]$
By substituting the values, we get $\frac{5R}{36}c{m}^{-1}$