This is given by:
\[E = \frac{{h^2 \pi^2}}{{2m a^2}} (n_x^2 + n_y^2 + n_z^2)\]
where \(h\) is the reduced Planck's constant, \(m\) is the mass, \(a\) is the length of the box, and \(n_x\), \(n_y\), and \(n_z\) are the quantum numbers corresponding to the x, y,
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