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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) (n² + n) where nx and ny are integers. The number of single-particle states with energy
5(h²/8mL²) is:
1
5
3
+
● 2

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