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Multiple choice
Two electrons occupy an infinite square well with single-particle energies
E
n
=
n
2
E
1
E_n = n^2 E_1
E
n
=
n
2
E
1
(take
E
1
=
1
E_1 = 1
E
1
=
1
). In the ground state, both electrons (opposite spins) fit in
n
=
1
n = 1
n
=
1
. What is the total energy in units of
E
1
E_1
E
1
?
5
4
2
1
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