Chapter 10: Q24CQ (page 467)
What are the some of the properties of fullerenes that make them potentially so useful?
Short Answer
The property of high tensile strength of the fullerenes makes it for potentially useful.
Chapter 10: Q24CQ (page 467)
What are the some of the properties of fullerenes that make them potentially so useful?
The property of high tensile strength of the fullerenes makes it for potentially useful.
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Get started for freeFormulate an argument explaining why the even wave functions in Fig 10.1 should be lower in energy than their odd partners.
Section 10.2 discusses - bonds and - bonds for p - states and -bonds for s-states but not - bonds for - states. Why not?
Explain the dependence of conductivity on temperature for conductors and for semiconductors.
Starting with equation (10-4), show that if is as a photon is emitted by a diatomic molecule in a transition among rotation-vibration states, but can be . Then the allowed photon energies obey equation (10-6).
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.
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