Which of the following describes tectonics?
A) the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface
B) the eruption of molten rock from a planet's interior to its surface
C) the disruption of a planet's surface by internal stresses
D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather
C
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What value of B should be used in a velocity selector to separate out 2.0-keV protons if E is fixed at 80 kV/m?
A. 0.18 T B. 0.11 T C. 0.15 T D. 0.13 T E. 0.23 T
Why does a high-mass star evolve differently from a low-mass star?
A. It has more material to burn so it can last longer. B. It is so bright that it drives material in space away from it so it can't gather up more fuel. C. It has a lower gravity so it can't pull in more fuel from space. D. It can fuse additional elements because its core can get hotter. E. The statement is false. High and low-mass stars evolve the same way.
Most nearby stars move relative to the Sun at speeds below about 30 km/s. Suppose you observe a nearby star that is moving much faster than this (say, 300 km/s). Which of the following is a likely explanation for its high speed?
A) It is probably a halo star that is currently passing through the disk. B) It is a very young star, recently formed. C) It has been pushed to high speed by the shock wave from a nearby supernova. D) It is a high mass star.
A hypothetical atom has four distinct energy states. Assuming all transitions are possible, the number of spectral lines this atom can produce is
A) 5. B) 6. C) 7. D) 8. E) more than 8.