Mercury's smooth plains are most similar to the Moon's:
A) maria.
B) highlands.
C) craters.
D) mountain ranges.
A
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Thin Lenses: If a object is placed between a convex lens and its focal point, the image formed is
A. virtual and upright. B. virtual and inverted. C. real and upright. D. real and inverted.
A normal heat engine is used to drive an electric generator. Part of the power from this generator runs a refrigerator that absorbs the waste heat from the engine and pumps it back into the hot reservoir.
A. first kind B. second kind
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)
A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. B) The luminosity of star 1 is a factor of 100 less than the luminosity of star 2. C) Star 1 is 100 times more distant than star 2. D) Star 1 is 100 times nearer than star 2. E) Star 1 is 10 times more distant than star 2.
What is the electron configuration for Li which has three electrons?
A) 1s3 B) 1s12s2 C) 1s22s1 D) 1s21p1 E) 1s11p2