Chapter 10: Q11CQ (page 466)
Explain the dependence of conductivity on temperature for conductors and for semiconductors.
The conduction band of the semiconductor will be partially filled with electrons as the temperature rises, and so the resistance of the semiconductor will decrease.
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
What are the some of the properties of fullerenes that make them potentially so useful?
In Figure 10.24, the band n = 1 ends at , while in Figure 10.27 it ends at. Are these compatible? If so, how?
As a crude approximation, an impurity pentavalent atom in a (tetravalent) silicon lattice can be treated as a one-electron atom, in which the extra electron orbits a net positive charge of 1. Because this "atom" is not in free space, however, the permitivity of free space, . must be replaced by , where is the dielectric constant of the surrounding material. The hydrogen atom ground-state energies would thus become
Given for silicon, how much energy is needed to free a donor electron in its ground state? (Actually. the effective mass of the donor electron is less than , so this prediction is somewhat high.)
Brass is a metal consisting principally of copper alloyed with a smaller amount of zinc, whose atoms do not alternate in a regular pattern in the crystal lattice but are somewhat randomly scattered about. The resistivity of brass is higher than that of either copper or zinc at room temperature, and it drops much slower as the temperature is lowered. What do these behaviors tell us about electrical conductivity in general?
In Figure 10.24, the n=1 band ends at , while in Figure 10.27 it ends at
What do you think about this solution?
We value your feedback to improve our textbook solutions.
