## Problem 15.3

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The graph shown represents the probability of occupation for an electron in a substance with a uniform density of states (unlike a metal where the density of states is proportional to *E*^{1/2}). This function can be plotted for several different temperatures. The integral shown is normalized and represents the probability of finding electrons of a certain energy range. What percentage of the electrons are within 10% of the Fermi energy at the various temperatures? Explain. Restart.