When a semi-conducting material is doped with an impurity, new acceptor levels are created. In a particular thermal collision, a valence electron receives an energy equal to 2 kT (k = Boltzmann Constant, T = Absolute Temperature) and just reaches one of the acceptor levels. Assuming that the energy of the electron was at the top edge of valence band and the temperature T is equal to 300 K . Find the energy of acceptor levels above the valence band.