1. The problem statement, all variables and given/known data Here is a picture: http://puu.sh/bZtAu/82bdc201bc.png [Broken] 2. Relevant equations For force, F = (Ze^2)/4 * pi * e0 * R^3) * r f = sqrt(k/m) * 1/2pi Where e0 = vacuum permeability, 8.854 x 10^-12m and r = radius of hydrogen atom, 5.3 x 10^-11m 3. The attempt at a solution I tried just plugging in values, For the first one, Ze = 1, right? Edit: I had an epiphany. Is e the constant (1.6 x 10^-19)? If so that makes a lot more sense. I tried it, still got the wrong answer though. So: 1/(4pi(8.854x10^-12)(.053x10^-9)^3) * (5.3 x 10^-11) = A very large number F. Then, I use that value of F to plug into the second equation, f = sqrt(F/m) * 1/(2pi) and I get an extremely large number. Note that for m I use 9.31 x 10^-31 kg -- is that right, or should I be using .511MeV/c^2? Should I be using units in terms of meters or nanometers? What kind of numbers should I be looking for? Will the frequency be extremely large? I don't have many tries left so I'd like to be sure my answer is right before submitting again. Thanks!