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Question 3 Qualitatively (so not using any formulae), explain: (a) How the Drude model predicts that the conductivity of metals decreases as the temperature increases.

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Question 3 Qualitatively (so not using any formulae), explain: (a) How the Drude model predicts that the conductivity of metals decreases as the temperature increases. (b) How the Quantum Free Electron Theory predicts that the conductivity of metals decreases as the temperature increases. (c) How the Band Theory predicts that the conductivity of silicon increases as the temperature increases. [2 marks for each part]

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