Compared to a low mass MS star, a high mass MS star has
A: lower luminosity, longer lifetime
B: higher luminosity, shorter lifetime
C: lower temperature, shorter lifetime
D: larger radius, longer lifetime
E: higher temperature, smaller radius
Ans: B: higher luminosity, shorter lifetime
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The Roche limit is the point at which
A) the mass of an object classifies it as a moon. B) a moon orbiting a planet experiences synchronous rotation. C) the external tidal forces on an object are strong enough to be felt by the object. D) the external tidal forces on an object become greater than the internal forces that hold it together. E) the internal forces that hold an object together weaken so that the object falls apart.
What is meant by the "habitable zone"?
A) the zone where water can be a liquid around the center of the Galaxy B) the region around each star where terrestrial planets could have liquid water on their surfaces C) the zone in which terrestrial-sized planets could form around each star D) the region in dense atmospheres like Jupiter's that water droplets could form E) the regions near the poles of Mercury where liquid water might exist
The material used in certain nuclear bombs is 239Pu, which has a half-life of about 20,000 years. How long must we wait for a buried stockpile of this substance to decay to 4.0% of its original 239Pu mass?
A) 93,000 y B) 64,000 y C) 45,000 y D) 800 y