One of the reasons that gold is a rare element is that:
A) it has a very low atomic mass.
B) it has a very low atomic number.
C) gold atoms were absorbed during supernova explosions.
D) gold atoms are made only by short-lived nuclear reactions.
D
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Distant dark-colored hills appear blue due to the color of the
A) atmosphere between the observer and the dark hills. B) selectively reflected light that reaches a distant observer. C) reflected light that survives scattering. D) sky that is reflected off the hills.
The geysers and hot springs of Yellowstone National Park result from
A) thin continental crust separating and creating a rift valley. B) plumes of hot mantle rising in a hot spot within a plate. C) plates that have slipped sideways relative to each other, creating a fault. D) a plate that has run up against an existing continental plate. E) a fault.
Compared with Newton's theory of gravity, Einstein's theory is
A) an exception to the correspondence principle. B) in accord with the correspondence principle. C) neither of these
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 5.0 cm, pitch = 12 cm, period = 5.0 ms). What is the speed of this particle as it moves along this path?
a. 67 m/s b. 26 m/s c. 63 m/s d. 24 m/s e. 87 m/s