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Copper has a density of 8.96 x 10³ kg/m³ and a resistivity of 1.70 × 1080.m.
A. On the basis of the classical free-electron gas model, assuming that each Cu atom
contributes one electron to the electron gas, calculate the average time between collisions
of the electrons.
B. Calculate the mean free path from the mean free time and the electron's thermal velocity.
C. How does the mean free path compare with the spacing between atoms in the lattice of
Cu?

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