bohr model Questions

If the binding energy of the electron in a hydrogen atom is $13.6\text{eV}$, the energy required to remove the electron from the first excited state of ${\text{Li}}^{++}$ is:

Suppose an electron is attracted towards the origin by a force $k/r$ where $k$ is a constant. By applying Bohr model, the radius $r_n$ and kinetic energy $T_n$ of the $n^{\text{th}}$ orbital are:

Ionisation energy of ${\text{He}}^{+}$ is $19.6\times 10^{-18}{\text{J atom}}^{-1}$. The energy of the first stationary state ($n=1$) of ${\text{Li}}^{2+}$ is:

Energy required for the electron excitation in ${\text{Li}}^{++}$ from the first to the third Bohr orbit is: