If electrical conductivity were determined by the mere static presence of positive ions, rather than by their motion, the collision time would be inversely proportional to the electron's average speed. If, however, it were dominated by the motion of the ions, it should be inversely proportional to the "area" presented by a jiggling ion, which is, in turn, proportional to the square of its amplitude as an oscillator. Argue that only the latter view gives the correct temperature dependence in conductors of σ α T-1. Use the equipartition theorem (usually covered in introductory thermodynamics and also discussed in Section 9.9).
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