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Chapter 10: Q49E (page 469)
In Figure 10.24, the n=1 band ends at , while in Figure 10.27 it ends at
It is proved that two ends are compatible.
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The left diagram in FIGURE 10.1 might represent a two atom crystal with two bands. Basing your argument on the kinetic energy inside either individual well, explain why both energies in the lower band should be roughly equal to that of the atomic state and why both energies in the upper should roughly equal that of the atomic state
Question: - For a small temperature change. a material's resistivity (reciprocal of conductivity) will change linearly according to
The fractional change in resistivity, also known as the temperature coefficient, is thus
Estimate for silicon at room temperature. Assume a band gap of 1.1 e v .
In the boron atom, the single electron does not completely fill any spatial state, yet solid boron is not a conductor. What might explain this? (It may be helpful to consider again why beryllium is not an insulator.)
Based only on the desire to limit minority carriers, why would silicon be preferable to germanium as a fabric for doped semiconductors?
Exercise 29 outlines how energy may be extracted by transferring an electron from an atom that easily loses an electron from an atom that easily loses an electron to one with a large appetite for electrons , then allowing the two to approach , forming an ionic bond.
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