Chapter 18: Problem 9
Briefly state what is meant by the drift velocity and mobility of a free electron.
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Chapter 18: Problem 9
Briefly state what is meant by the drift velocity and mobility of a free electron.
These are the key concepts you need to understand to accurately answer the question.
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(a) Calculate the number of free electrons per cubic meter for silver, assuming that there are \(1.3\) free electrons per silver atom. The electrical conductivity and density for \(\mathrm{Ag}\) are \(6.8 \times 10^{7}(\Omega \cdot \mathrm{m})^{-1}\) and \(10.5 \mathrm{~g} / \mathrm{cm}^{3}\), respectively. (b) Now, compute the electron mobility for \(\mathrm{Ag}\).
In terms of electron energy band structure, discuss reasons for the difference in electrical conductivity among metals, semiconductors, and insulators.
The polarization \(P\) of a dielectric material positioned within a parallel- plate capacitor is to be \(4.0 \times 10^{-6} \mathrm{C} / \mathrm{m}^{2}\) (a) What must be the dielectric constant if an electric field of \(10^{5} \mathrm{~V} / \mathrm{m}\) is applied? (b) What will be the dielectric displacement \(D\) ?
Germanium to which \(10^{24} \mathrm{~m}^{-3}\) As atoms have been added is an extrinsic semiconductor at room temperature, and virtually all the As atoms may be thought of as being ionized (i.e., one charge carrier exists for each As atom). (a) Is this material \(n\)-type or \(p\)-type? (b) Calculate the electrical conductivity of this material, assuming electron and hole mobilities of \(0.1\) and \(0.05 \mathrm{~m}^{2} / \mathrm{V} \cdot \mathrm{s}\), respectively.
What is the distinction between electronic and ionic conduction?
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