Sun is considered to be a
A) low-mass star.
B) intermediate-mass star.
C) high-mass star.
D) brown dwarf.
A
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How do we think the "hot Jupiters" around other stars were formed?
A) They formed as jovian planets close to the star in the same orbits that they are seen today. B) They formed as dense, rocky planets close to the star in the same orbits that they are seen today. C) They formed as jovian planets beyond the frost line and then migrated inward. D) Many planets were formed around the star but coalesced into a single planet close in. E) They spun off from the young star when it was rapidly rotating.
In terms of dark, smoother maria and cratered highlands, which Jovian moon most resembles the near side of our own?
A) Titan B) Io C) Europa D) Triton E) Ganymede
A "critical mass" is needed for a chain reaction because
A) if the mass is too small the temperature achieved during fission will be too low to sustain the reaction. B) if the mass is too large, the temperature will get too high and the entire mass will blow up without fissioning. C) if the mass is too large, the density will be too high to sustain a chain reaction. D) if the mass is too small, too many neutrons will leak out without causing fission. E) if the mass is too small, there will not be enough uranium to start the reaction.
Which of the following were found from Millikan's oil drop experiment?
a. the weight, and hence the mass, of the electron b. all of the above c. that quarks have charges that are fractions of the electronic charge d. the value of the electron's quantized charge