The mean free time:
For silicon, m = 9.1 × 10-31, n = 1.0 × 1016 electrons/m3, e = 1.6 × 10-19C and ρ = 2300Ω•m.
Pure silicon contains approximately 1.0x 1016 free electrons per cubic meter.
(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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