1. The problem statement, all variables and given/known data • Consider a hydrogen atom in its ground level, placed in a magnetic field of 0.7 T along the z axis. (a) What is the energy difference between the spin-up and spin-down states? (b) An experimenter wants to excite the atom from the lower to the upper state by sending in photons of the appropriate energy. What energy is this? What is the wavelength? What kind of radiation is this? (Visible? UV? etc.) This is more a theoretical question. I have received mixed answers from people. Can anyone clarify? 2. Relevant equations 3. The attempt at a solution a.) By theory I have read, supposedly there is no spin for s-levels. In other words, In ground state there is no spin-up and down and therefore no splitting of Energies by a magnetic field. So, There is no energy difference, because there is no spin-up or down on the ground state. b I guess it would be En=Eo/(n^2) Help please.