The ionization energy of hydrogen atom is 13.6 eV. Find the energy coresponding to a transition between 3rd and 4th orbit.

The ionization enthalpy of hydrogen atoms is 1.312xx10^(6) J" mol"^(-1) The energy required to excite the electron the atom from n =1 to n=2 is :

Energy of ground state of hydrogen atom is - 13.6 eV. What is its ionisation potential?