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Chapter 10: Q8CQ (page 466)
Why should magnesium form a metallic solid?
Magnesium will then solidify into a metallic solid. Hence, magnesium forms a metallic solid.
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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 “area" 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).
Of , and , none has an electric dipole moment, but one does have a magnetic dipole moment, which one, and why?
(Refer to figure 10.10)
Explain the dependence of conductivity on temperature for conductors and for semiconductors.
Question: - (a) Compare equation (10-11) evaluated at room temperature for a silicon band gap of 1.1 eV and for a typical donor-state/conduction band gap of 0.05 eV.
(b) Assuming only one impurity atom for every 10³ silicon atoms, do your results suggest that majority carriers, bumped up from donor levels. should outnumber minority carriers created by thermal excitation across the whole 1.1 eV gap? (The calculation ignores the difference in density of states between donor levels and bands, which actually strengthens the argument.)
The diagram shows a bridge rectifier circuit. A sinusoidal input voltage is fed into four identical diodes. each represented by the standard diode circuit symbol. The symbol indicates the direction of conventional current flow through the diode. The plots show input and output voltages versus time. Note that the output voltage is strictly in one direction. Explain
(a) how this circuit produces the unidirectional output voltage it does, and
(b) what features in the output plot indicate that the band gap of the diodes is about half an electronvolt, (It might seem that about one volt is correct, but consider how many diodes are on and in series at any given instant. In fact, although not the usual habit, it might be more accurate to plot the output voltage shifted upward relative to the input.)
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