I need to find the energy spectrum for the energes of photons that end up in the 1st excited state from a neutron in a gravitational field of strength g (9.8). I suppose first I need to find an expression for U(x) and substitue into the Schrodinger equation? How do I know U(x)? We have been using Airy functions in class -- how do I apply these here? I guess I just need someone to get me started on this one with a hint or two!