A ground-state hydrogen atom absorbs a photon of energy 10.2eV.
(i) To which stationary state is the electron promoted?
(ii) If the electron subsequently returns directly to the ground state, find the wavelength of the emitted radiation.
(Take h=6.63×10−34J s, c=3.00×108m s−1, 1eV=1.602×10−19J.)