513.001 Molecular and Solid State Physics

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Physical
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Exam question 3 - March 11, 2008

The density of states for a particular material is given in the following figure. The total electron density is 8 × 1028 electrons/m³.

(a) Is this material a metal, an insulator, or a semiconductor? Why?

(b) What is the limiting value of the Fermi energy as the temperature approaches zero?