Chapter 18: Problem 6
What is the distinction between electronic and ionic conduction?
Chapter 18: Problem 6
What is the distinction between electronic and ionic conduction?
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Get started for freeAt room temperature the electrical conductivity of \(\mathrm{PbS}\) is \(25(\Omega-\mathrm{m})^{-1}\), whereas the electron and hole mobilities are 0.06 and \(0.02 \mathrm{m}^{2} / \mathrm{V}-\mathrm{s},\) respectively. Compute the in trinsic carrier concentration for PbS at room temperature.
(a) Explain why no hole is generated by the electron excitation involving a donor impurity atom. (b) Explain why no free electron is generated by the electron excitation involving an acceptor impurity atom.
Estimate the temperature at which GaAs has an electrical conductivity of \(1.6 \times 10^{-3}\) \((\Omega-m)^{-1}\) assuming the temperature dependence for \(\sigma\) of Equation \(18.36 .\) The data shown in Table 18.3 might prove helpful.
Briefly tell what is meant by the drift velocity and mobility of a free electron.
Some hypothetical metal is known to have an electrical resistivity of \(3.3 \times 10^{-8}(\Omega-\mathrm{m})\) Through a specimen of this metal \(15 \mathrm{mm}\) thick is passed a current of 25 A; when a magnetic field of 0.95 tesla is simultaneously imposed in a direction perpendicular to that of the current, a Hall voltage of \(-2.4 \times 10^{-7} \mathrm{V}\) is measured. Compute (a) the electron mobility for this metal, and (b) the number of free electrons per cubic meter
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