To make a p-type semiconductor from silicon, one element that might be added as an impurity is ________.
Fill in the blank(s) with the appropriate word(s).
boron
gallium
indium
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Suppose the main water pipe breaks in a nuclear power plant, shutting off the water flow. If the control rods fall immediately into place, stopping the chain reaction, is there still a problem?
A) Yes, because radioactivity continues to create lots of thermal energy. B) Yes, because the uranium can still fission even though it is not chain-reacting. C) Yes, because the control rods stop only the fissioning of uranium and not the fissioning of plutonium. D) No, because no heat can be created once the fission reaction is shut off. E) No, because the small amount of heat that continues being created is not enough to cause any danger.
A coil lies flat on a table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?
A) The induced current flows counterclockwise. B) There is no induced current in this coil. C) The induced current flows clockwise. D) The current flows clockwise initially, and then it flows counterclockwise before stopping.
A particle (m = 50 g, q = 5.0 mC) is released from rest when it is 50 cm from a second particle (Q = -20 mC). Determine the magnitude of the initial acceleration of the 50-g particle
a. 54 m/s2 b. 90 m/s2 c. 72 m/s2 d. 65 m/s2 e. 36 m/s2
Which of the following best describes how the Drake equation is useful?
A) It helps us understand what we need to know to determine the likelihood of finding other civilizations. B) It has allowed us to determine the number of civilizations in the Milky Way Galaxy. C) It allows us to calculate the masses of planets orbiting other stars. D) It tells us what wavelengths of light will be most useful to examine in the search for extraterrestrial intelligence.