40. As an engineer, one parameter you have direct control over in engineering th

Question

40. As an engineer, one parameter you have direct control over in engineering the electronic properties of silicon is: a. The density of dopants in the silicon. b. The dopant type introduced into the silicon. c, Both A & B. d. None ofthe above. Moore's law: a. Describes a law of plnysics. b, Describes a "law" of human engineering, c. Describes a law of thermodynamics. d. Describes a law of the West, 42. In thermal equilibrium: a. The rate of EHP generation is greater than the rate of EHP recombination. b. The rate of EHP generation is the same as rate of EHP recombination. e. The rate of EHP generation is less than the rate of EHP recombination. d. if the silicon is intrinsic. ne po. 43. For a homework problem, you calculate a charge carrier density. Your answer should have which units? a. J or eV b. /cm or J. Amps. d. /cm 44. Excess electrons in a piece of semiconductor are shown schematically below. Based on this diagram, choose the true statement: a. The electrons will diffuse from right to left, and the conventional diffusion current due to these moving electrons will be from right to left. h. The electrons will diffuse from right to left, and the conventional diffusion current due to these moving electrons will be from left to right. c. The electrons will diffuse from left to right, and the conventional drift current due to these moving electrons will be from left to right. d. The electrons will diffuse from right to left, and the conventional drift current due to these moving electrons will be from left to right.

Explanation / Answer

40 (c) both A and B

42 (b)

43 (d)

44 (b)

46 (c) quantize energy

48 (a) , because n>p ,dn/dx =0. and dp/dx=0

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