The following diagram indicates the energy levels of a certain atom. When the system moves from 4E level to E, a photon of wavelength ${\mathrm{\lambda }}_1$ is emitted. The wavelength of photon produced during it’s transition from $\frac{7}{3}\mathrm{E}$ level to E is ${\mathrm{\lambda }}_2$.  The ratio $\frac{{\mathrm{\lambda }}_1}{{\mathrm{\lambda }}_2}$ will  be