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Chapter 10: 5CQ (page 413)
It takes less energy to dissociate a diatomic fluorine molecule than a diatomic oxygen molecule (in fact, less than one-third as much). Why is it easier to dissociate fluorine?
Because it has less number of covalent bonds.
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In Figure 10.24, the n=1 band ends at , while in Figure 10.27 it ends at
Question:If electrical conductivity were determined by the mere static presence of positive ions rather than by their motion the collision time would be inversely proportional to the electron's average speed. If however, it were dominated by the motion of the ions, it should be inversely proportional to the 鈥渁rea" presented by a jiggling ion, which is in turn proportional to the square of its amplitude as an oscillator. Argue that only the latter view gives the correct temperature dependence in conductors of . Use the equipartition theorem (usually covered in introductory thermodynamics and also discussed in Section 9.9).
Section 10.6 notes that as causes of resistance, ionic vibrations give way to lattice imperfections at around 10 K. A typical spring constant between atoms in a solid is or order of magnitude and typical spacing is nominally . Estimate how much the vibrating atoms locations might deviate, as a function of their normal separations, at 10 K.
Sketch an energy-versus-position diagram. Complementary to Figure 10.4, showing valence hole motion a conduction electron participation in an operating pnp transistor.
Carbon(diamond) and silicon have the same covalent crystal structure, yet diamond is transparent while silicon is opaque to visible light. Argue that this should be the case based only on the difference in band gaps roughly 5 eV for diamond in eV is silicon.
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