Wilson-Sommerfeld quantization rules

1. Sep 17, 2009

th5418

1. The problem statement, all variables and given/known data
Use the Wilson-Sommerfeld quantization rules to obtain the energy levels of a perfectly elastic particle of mass m in a cubic box of edge a in terms of the quantum numbers $$n_x, n_y, n_z$$

2. Relevant equations
$$\oint pdq = nh$$
Where p is a momentum, and dq is the corresponding coordinate system.

3. The attempt at a solution
Am I suppose to solve schrodinger's equation for particle in a box? That's the only way I know how...