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Six electrons are in a two-dimensional square potential energy well with sides of length L. The potential energy is infinite at the sides and zero inside. The single-particle energies are given by (h2 /8mL2 )(n2x + n2y ), where nx and ny are integers. If a seventh electron is added to the system when it is in its ground state the least energy the additional electron can have is:

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Six electrons are in a two-dimensional square potential energy well with sides of length L. The potential energy is infinite at the sides and zero inside. The single-particle energies are given by (h2 /8mL2 )(n2x + n2y ), where nx and ny are integers. If a seventh electron is added to the system when it is in its ground state the least energy the additional electron can have is:






 
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