Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths $r=\large\frac{\lambda _1}{\lambda_2}$, is given by :

Question

$\begin{array}{1 1} (1)\;r= \frac{4}{3} \\ (2)\; r= \frac{2}{3} \\(3)\; r= \frac{3}{4} \\ (4) r= \frac{1}{3} \end{array} $