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.
Answer: D
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Which of the following is a principal advantage of CCDs over photographic film?
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The ionosphere reflects __________ frequency radio waves
Fill in the blank(s) with correct word
A particle (charge = +2.0 mC) moving in a region where only electric forces act on it has a kinetic energy of 5.0 J at point A. The particle subsequently passes through point B which has an electric potential of +1.5 kV relative to point A. Determine the kinetic energy of the particle as it moves through point B.
A. 3.0 J B. 2.0 J C. 5.0 J D. 8.0 J E. 10.0 J
What are gravitational waves?
A) a type of energy that is different from light and that has been detected from sources such as merging neutron stars and black holes B) a form of light with higher energy than gamma rays C) a form of light with lower energy than radio waves D) the name we give to electromagnetic waves that come from astronomical objects that have gravity