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**Quantum mechanics- help!?**

An innitely deep one-dimensional potential well runs from x = 0 to x = a. Let a particle be placed in the

ground state corresponding to this system. Then, within innitly short time, expand the potential well so that it now runs from x = 0 to x = 2a. If the energy of this particle is now measured, what is the probability of nding it in the ground state corresponding to this new system.? What is the probability of nding it in the rst excited state state?