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Chapter 10: Q49E (page 469)
In Figure 10.24, the band n = 1 ends at , while in Figure 10.27 it ends at. Are these compatible? If so, how?
It is proved that two ends are compatible.
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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?
Carry out the integration indicated in equation (10.10)
Question: The diagram shows the energy bands of a tunnel diode as the potential difference is increased. In this device high impurity atom density causes the occupied donor and unoccupied acceptor levels to spread into impurity bands which overlap respectively the n-type conduction- and the p-type valence bands. In all unbiased diodes, the depletion zone between the n-type and p-type bands constitutes a potential barrier (see Section 6.2) but in the tunnel diode it is so thin that significant tunnelling occurs. The current versus voltage plot shows that unlike a normal diode significant current begins to flow as soon as there is an applied voltage—before the bias voltage is Egap /e. It then decreases (so called negative resistance) before again increasing in the normal way. Explain this behavior.
why is covalent bonding directional, while ionic bonding is not?
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)
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