What is the energy of the electron revolving in the third orbit expressed in $ eV $ (in $eV$)?

Consider the following electronic energy level diagram of $H-$ atom. Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labelled:

The ratio of the kinetic energies of the electrons in the third and fourth excited states of the hydrogen atom is

In an atom, the difference between two energy levels is $3.31 \ eV$. The wavelength of the radiation emitted when the transition takes place between these levels is nearly: (in $Å$)

The minimum excitation energy of an electron revolving in the first orbit of hydrogen is (in $eV$)

The ground state energy of a hydrogen atom is $-13.6 \ eV$. The potential energy of the electron in the first excited state of hydrogen is (in $eV$)