The Number Density N of Conductions Electrons, the Resistivity $\rho$ , and the Temperature Coefficient of Resistivity

question 13

Multiple Choice

The number density n of conductions electrons, the resistivity $\rho$ , and the temperature coefficient of resistivity $\infty$ are given below for five materials. Which is a semiconductor?

• A) n = 10²⁹ m^-3, \(\rho\) = 10^-8 \(\Omega\) . m, \(\infty\) = +10^-3 K^-1
• B) n = 10²⁸ m^-3, \(\rho\)= 10^-9 \(\Omega\). m, \(\infty\) = -10^-3 K^-1
• C) n = 10²⁸ m^-3, \(\rho\) = 10^-9 \(\Omega\) . m, \(\infty\) = +10^-3 K^-1
• D) n = 10¹⁵ m^-3, \(\rho\) = 10³ \(\Omega\) .m, \(\infty\) = -10^-2 K^-1
• E) n = 10²² m^-3, \(\rho\) = 10^-7 \(\Omega\) .m, \(\infty\) = +10^-3 K^-1

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