1. The problem statement, all variables and given/known data I'm having some trouble working out the math for the D-lines in the sodium spectrum. Now the measured wavelengths are 5889.96 angstroms and 5895.93 angstroms. It's easy enough to find the energy difference between these to be .00213 eV. Now I'm supposed to be able to figure out the strength of the atomic magnetic field from here, but the class I'm in has really gotten to be over my head recently and I haven't been able to keep up with all the math/formulas 2. Relevant equations the potential energy of a dipole in a field is given by -[tex]\mu[/tex]*B. 3. The attempt at a solution honestly don't know what I'm doing here. I found the energy difference I need to arrive at, as stated above, but aside from that I'm starting to think that taking a quantum physics course for "fun" probably wasn't the best move.