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Chapter 10: Q74E (page 470)
Question: The critical temperature lead is 7.2 K. What is the binding energy of its Cooper pairs at zero temperature?
Answer
The binding energy of the Cooper pairs is 217meV.
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The bond length of the molecule is , and its effective spring constant is at room temperature.
(a) What would be the ratio of molecules with rotational quantum number to those with (at the same vibrational level), and
(b) What would be the ratio of molecules with vibrational quantum number to those with (with the same rotational energy)?
Question: Volumes have been written on transistor biasing, but Figure 10.45 gets at the main idea. Suppose that and that the "input" produces its own voltage . The total resistance is in the input loop, which goes clockwise from the emitter through the various components to the base, then back to the emitter through the base-emitter diode. this diode is forward biased with the base at all times 0.7 V higher than the emitter. Suppose also that Vcc = 12 V and that the "out- put" is . Now. given that for every 201 electrons entering the emitter, I passes out the base and 200 out the collector, calculate the maximum and minimum in the sinusoidally varying
(a) Current in the base emitter circuit.
(b) Power delivered by the input.
(c) Power delivered to the output.
(d) Power delivered byVce.
(e) what does most of the work.
It is often said that the transistor is a basic element of amplification, yet it supplies no energy of its own. Exactly what is its role in amplification?
The effective force constant of the molecular “spring” in HCL is , and the bond length is .
(a) Determine the energies of the two lowest-energy vibrational states.
(b) For these energies, determine the amplitude of vibration if the atoms could be treated as oscillating classical particles.
(c) For these energies, by what percentages does the atomic separation fluctuate?
(d) Calculate the classical vibrational frequencyand rotational frequency for the rotational frequency, assume that L is the its lowest non zero value, and that the moment of inertia is .
(e) Is is valid to treat the atomic separation as fixed for rotational motion while changing for vibrational?
Question: When electrons cross from the n-type to the p-type to equalize the Fermi energy on both sides in an unbiased diode they leave the n-type side with an excess of positive charge and give the p-type side an excess of negative. Charge layers oppose one another on either side of the depletion zone, producing. in essence, a capacitor which harbors the so-called built-in electric
field. The crossing of the electrons to equalize the Fermi energy produces the dogleg in the bands of roughly Egap , and the corresponding potential differerence
is Egap /e. The depletion zone in a typical diode is wide, and the band gap is 1.0 eV. How large is the built-in electric field?
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