The resistivities of Na, Au, and Sn at T = 273 K are 4.2 cm,

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The resistivities of Na, Au, and Sn at T = 273 K are 4.2 μΩ • cm, 2.04 μΩ • cm, and 10.6 μΩ • cm, respectively. Use these values and the Fermi speeds calculated in Problem 8 to find the mean free paths λ for the conduction electrons in these elements.

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