Thanks Vela, that's exactly what I needed.
I was able to equate the kinetic energy equation with the orbital energy level equation and solve for n, like so:
http://imgur.com/7a7uu
Homework Statement
An electron moves with speed v=10-4c inside a one dimensional box (V=0) of length 48.5 nm. The potential is infinite elsewhere. The particle may not escape the box. What approximate quantum number does the electron have?Homework Equations
En =...