Like the Sun, main sequence stars are converting hydrogen into helium in their cores
Indicate whether the statement is true or false
TRUE
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A semiconductor is produced by doping Group IV silicon with 1023 atoms per cubic meter of Group III gallium. Assume that at room temperature this semiconductor is in the extrinsic range of operation.
(a) What type of semiconductor is this? (b) Calculate the room-temperature electrical conductivity of this semiconductor. (c) Clearly state any assumptions you made in calculating the electrical conductivity in part (b).
A likely ratio of the masses of oxygen in two different compounds of tin and oxygen, both of which contain the same mass of tin, is
a. 1.42 to 1. b. 3.11 to 1. c. 3.77 to 1. d. 2 to 1.
What does the moderator do in a nuclear reactor?
a. It is a safety feature that limits the nuclear reaction. b. It absorbs neutrons. c. It slows down neutrons. d. none of the above
For main-sequence stars, which of the following is true about low-mass stars compared to high-mass stars?
A) Low-mass stars are cooler and less luminous than high-mass stars. B) Low-mass stars are hotter and more luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars are hotter but less luminous than high-mass stars. E) Low-mass stars have the same temperature and luminosity as high-mass stars.