If a wave has a frequency of 8 Hz, it has a period of _______.
a. 1/8 s.
b. 8.5 s.
c. 8 s.
d. 4 s.
Answer: a. 1/8 s.
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What do we think condensed out of the solar nebula?
a. hydrogen and helium b. hydrogen compounds c. rocky material d. metals e. all except a
Jovian planets
a. have rings and large numbers of moons. b. all have many moons, but only Saturn has rings. c. have moons, but Uranus and Neptune have only one or two. e. are massive and rotate slowly.
Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?
A. Star A is hotter and smaller than Star B. B. Star A is cooler and bigger than Star B. C. Star A is hotter and bigger than Star B. D. Star A is cooler and smaller than Star B.
Displacement: Suppose that an object travels from one point in space to another. Make a comparison between the magnitude of the displacement and the distance traveled by this object.
A. The displacement is either greater than or equal to the distance traveled. B. The displacement is always equal to the distance traveled. C. The displacement is either less than or equal to the distance traveled. D. The displacement can be either greater than, smaller than, or equal to the distance traveled.