513.001 Molecular and Solid State Physics

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Density of states

The density of states of a material is shown below. The dashed lines indicate where the Fermi energy would be if there were 1 electron/unit cell, 2 electrons/unit cell, etc.

What kind of material would this be if there were

(a) One electron per unit cell.
(b) Two electrons per unit cell.
(c) Five electrons per unit cell.
(d) Eight electrons per unit cell.
(e) Ten electrons per unit cell.