Calculate $\lambda$ of the radiations when the electrons jumps from III to II orbit for H atom.The electronic energy in II and III Bohr's orbit of H atom are $-5.42\times 10^{-12}$ and $-2.41\times 10^{-12}$erg respectively.

Question

$(a)\;6603A^{\circ}\qquad(b)\;7364^{\circ}\qquad(c)\;5462A^{\circ}\qquad(d)\;6963A^{\circ}$