The energy of electron in the ground state of Hydrogen atom is -13.6ev. The kinetic energy of the electron is the 4th orbit is

The energy of electron in the 4th orbit is given by $\frac{-13.6}{{\mathrm{n}}^2}$.

So total energy in 4th orbit is given by $\frac{-13.6}{16}=-0.85\mathrm{eV}$.

As we know K.E=-T.E, the kinetic energy of electron in 4th orbit will be 0.85eV.