Physicists today consider the Bohr model of the atom to be
A) an accurate picture of a hydrogen atom.
B) totally useless — of historical interest only.
C) oversimplified, but nevertheless useful.
Answer: C
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Suppose that the star Betelgeuse (the upper left shoulder of Orion) were to supernova tomorrow (as seen here on Earth). What would it look like to the naked eye?
A) Betelgeuse would remain a dot of light but would suddenly become so bright that for a few weeks we'd be able to see this dot in the daytime. B) We'd see a cloud of gas expanding away from the position where Betelgeuse used to be. Over a period of a few weeks, this cloud would fill our entire sky. C) Because the supernova destroys the star, Betelgeuse would suddenly disappear from view. D) Betelgeuse would suddenly appear to grow larger in size, soon reaching the size of the full Moon. It would also be about as bright as the full Moon.
Coronae on Venus are believed to be
a. impact craters. b. caused by rising convection currents in the interior of Venus. c. the result of plate tectonics. d. located only in the polar regions of Venus. e. much older than the highlands such as Ishtar Terra.
Suppose the pressure of 20 g of an ideal monatomic gas is tripled while its volume is halved. What happens to the internal energy of the gas?
a. It stays the same, as the described changes do not involve internal energy. b. It increases. c. It decreases. d. This depends on the molecular weight of the gas involved, thus this is indeterminate.
When the distance between two stars decreases by one-third, the force between them
A) decreases by one-third. B) decreases by one-half. C) increases to twice as much. D) increases to nine times as much. E) none of the above