GPS stands for
a. the metric system of measurement.
b. grams per second.
c. Global Positioning System.
d. a space shuttle.
e. none of the above.
c
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A mega-parsec (Mpc) is equivalent to
a. 3.26 light-years. b. 206,265 light years. c. 1,000,000 light years d. 3,260,000 light-years. e. the diameter of the Milky Way galaxy.
Which of the following statements about a globular cluster is true?
A) All stars in the cluster are approximately at the same stage in evolution. B) Most of the stars in the cluster are younger than 10 billion years old. C) Most stars in the cluster are yellow or reddish in color. D) All stars in the cluster have approximately the same mass. E) There is an approximately equal number of all types of stars in the cluster.
At a particular instant, a proton moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A) downward. B) upward. C) zero. D) toward the north. E) toward the south.
X-rays of wavelength 0.080 nm are used in a Bragg scattering experiment with a crystal. If the first order maximum is found at a grazing angle of 
what is the plane spacing in the crystal?
A. 0.31 nm B. 0.71 nm C. 1.4 nm D. 0.38 nm E. 0.77 nm