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