Question

(iv) For a simple cubic erystal Ano 0.43 836 74838, while for a face centered cubic crystal Aro 12.31 aad As 16.97. Which crystal structure is more strongly bound at equilibrium?5 Question 4 (25 marks) (i) Name any three properties of metals and expiain these on the basis of the classical free electron theory of metals (B) [7l (i) Describe the breakdown of the classicel theory of conduction in metals, and how the application of quantum mechanics explained the breakdown [71 (ai) Show that the Drude classical theory of metals is consistent with the Wiedemann-Franz law which relates thermal and electrical conductivities (b) By stating the necessary assumptions, show that the relaxation time for electrons in copper is given by m/(nep)

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Answer 1

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