Physics - Modern Physics Question with Solution | TestHub

The energy is required to remove${\text{e}}^{-}$from singly ionized helium atom$= 54.4 \mathrm{e}\mathrm{V}$. The energy required to remove${\text{e}}^{-}$from a helium atom$=x\mathrm{ eV}$, given$\mathrm{54.4 }\mathrm{e}\mathrm{V}=\mathrm{2.2 }x\Rightarrow x=24.73 \mathrm{e}\mathrm{V}$. The energy required to ionize helium atom$= 79.13 \mathrm{e}\mathrm{V}\approx 79 \mathrm{eV}$.