(a) Give a definition of electrical resistivity and state how it is related to electrical conductivity,
(b) At 273-290K, the electrical resistivities of diamond, Si, Ge and a-Sn are approximately 1 x 1011, 1 x 10—3,0.46 and 11 x 10-8Ωm. Rationalize this trend in values,
(c) How does the change in electrical resistivity with temperature vary for a typical metal and for a semiconductor?
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