A hydrogen atom in its ground state is to be ionised by monochromatic radiation.
(i) Calculate the minimum energy (in eV) that the radiation must supply to a ground-state hydrogen atom.
(ii) Determine the corresponding minimum frequency of the radiation.
(iii) Find the longest wavelength that can bring about this ionisation.
Use h=6.63×10−34J s, c=3.0×108m s−1 and 1eV=1.6×10−19J.