The longest wavelength of light that can be used for the ionisation of dipositive lithium in its ground
state is y × 10^–8 m. The value of y according to bohr's theory is ____________. (Nearest Integer)

(Given : Energy of the electron in the first shell of the hydrogen atom is $-2.2\times {10}^{-18} \mathrm{J}$; $\mathrm{h}=6.63\times {10}^{-34}\mathrm{Js}$ and $\mathrm{c}=3\times {10}^8{ \mathrm{ms}}^{-1}$ )