1. The problem statement, all variables and given/known data The Lyman alpha radiation for hydrogen (nf=2, ni=1) has a wavelength of 1216 angstroms. Using the simplified model of an infinite 1D potential well, derive an estimate of the diameter of the hydrogen atom. How does this value compare with twice the Bohr radius 2r=1.06anstroms? 2. Relevant equations I imagine maybe De Broglie's relation, or the energy of a potential well. 3. The attempt at a solution I have no idea how I can relate a potential well to the radiation given off by hydrogen. I realize that I'm supposed to work this out myself, but my exam is tomorrow morning and would appreciate if I could get the solution, or at least a hefty hint.