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The solution of Schrodingers equation for the simple "particle in a box" problem is:

E = (n^2)(h^2) / 8m(L^2)

where L = the length of the box.

See http://en.wikipedia.org/wiki/particle_in_a_box" [Broken]

Say that the initial energy of the particle is E1.

If at a later time the length of the box is changed (a moveable wall), then there are now a completely new set of possible energies available, for n=1,2,3 etc. What if none of these new allowed energies equals the original energy of the particle?

What happens to the energy difference?

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# Particle in a box question

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