1. The problem statement, all variables and given/known data The following diagram represents the allowed electronic energy levels of a hypothetical atom. What frequency photon would be required to ionize this atom if it were already in the n = 2 state? [PLAIN]http://img32.imageshack.us/img32/667/picture2vt.png [Broken] 2. Relevant equations E = hf 3. The attempt at a solution Ionizing the atom would require emission of a photon. From the picure, E = 4eV for an emission of a photon: 4eV = hf f= 9.65e14 Hz but this is not the answer. Any suggestions??