**(a) **

Mean free time, T_{λ}

$\overline{){{\mathbf{T}}}_{{\mathbf{\lambda}}}{\mathbf{=}}\frac{\mathbf{m}}{\mathbf{n}{\mathbf{e}}^{\mathbf{2}}\mathbf{\rho}}}$

Pure silicon contains approximately 1.0 x 10^{16} free electrons per cubic meter.

Resistivities at Room Temperature (20 °C)

(a) Referring to the table above, calculate the mean free time for silicon at room temperature.

(b) Your answer in part (a) is much greater than the mean free time for copper. Why, then, does pure silicon have such a high resistivity compared to copper?

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