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

Question

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

(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?

Pure silicon contains approximately 1.0 (a) Referring to the table above, calculate the mean free time ? for silicon at room temperature. s (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? X 10^16 free electrons per cubic meter.

Explanation / Answer

formula for free mean time T = m/(n e^2 rho)

T = 9.11e-31/(1e16 * 1.6e-19 *1.6e-19 * 2300)

T = 1.547 *10^-12 secs

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as Copper is a coductor and silicon in semiconductor, they show such variations

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