The Wiedemann-Franz law connects the thermal and electrical conductivity of a free electron gas in the Drude or nearly free electron gas approximation. The statement is (Eq. 6.38b):where κel is the thermal and σel the electrical conductivity. From this law, it follows that one cannot expect a good simple metal to be a good ZT material because the thermal conductivity must be also high. Calculate the thermal conductivity if the σel = 10⁴ S/m at T = 300 K.

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Tol Kel 3q?