When an electron is transisted from 2E to E energy level, the wavelength of resultant photon produced is ${\lambda }_1$. If electron transition involves  $\frac{4}{3}$E to E level, the wave length  of resultant photon is ${\lambda }_2$ . The correct relation between  ${\lambda }_1\&{\lambda }_2$ is ${\lambda }_2=X{\lambda }_1$ . Then find the value of x ?