So I have the equation 1/lambdamn = R(1/(n^2) - 1/(m^2)) Where m > n, and lambda is the energy emitted by a photon from m going down to n. And I have to get show that this formula can be explained by 1.) Requiring that light occurs in quanta 2.) And to get a formula for Energy in terms of R. I had previously derived this forumula E = - e^2 / 4*pi*eo*an + n^2*(hbar)/^2/2m*an where a is the radius of the electron orbit, n will be 1 for our purposes, etc. How do I go about getting an equation for part 2...and how do I even begin part 1? Any help is appreciated, thanks!