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amjad-sh
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Homework Statement
A particle is in the ground state of a box of length L.Suddenly the box expands (symmetrically) to twice its size, leaving the wave function undisturbed.Show that the probability of finding the particle in the ground state of the new box is (8π/3).
Homework Equations
If n is odd : [itex]\psi_{n}(x)=√(2/L)*cos(nπx/L)[/itex]
If n is even: [itex]\psi_{n}(x)=√(2/L)*sin(nπx/L)[/itex]
[itex]\int_{-L}^{L}\psi_{n}(x)dx=1[/itex]
The Attempt at a Solution
If someone can give me a hint because I don't know where to begin.