A doubly ionized lithium atom is hydrogen like atomic number $Z=3$ . Find the wavelength of radiation required to excite electron in $\;Li^{+2}\;$ from first to third Bohr orbit . Given the ionization energy of hydrogen atom as $\;13.6 eV\;.\;$

Question

$(a)\;226.42 A^{0}\qquad(b)\;192.62 A^{0}\qquad(c)\;286.38 A^{0}\qquad(d)\;113.74 A^{0}$