How Do You Calculate Energy Levels in a 3-D Infinite Potential Well?

klhall2
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For the second, third, fourth, and fifth levels of the three-dimensional cubical box, find the energies in terms of the quantity Eo=π2*h2/(2mL2), where m is the particle mass and L is the box's sidelength.
 
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Come now, this is standard homework. The reason probably why you haven't got an answer is because you've made no attempt in solving it yourself.
 

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