The frequency of a wave is measured in
a) hertz.
b) vibrations per meter.
c) meters per second.
d) cycles.
•
a
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In the context of the unified model of active galactic nuclei (AGN), you see jets of gas and radiation emerging perpendicular to the accretion disk of an AGN and coming straight at you if:
A) the accretion disk is tilted at an angle of 30 degrees to your line of sight. B) you look directly into the central cavity around the black hole. C) you view the accretion disk from its edge. D) the accretion disk is tilted at an angle of 60 degrees to your line of sight.
Pure water is classified as
A. an insulator. B. a conductor. C. a semiconductor. D. all of these choices are correct E. none of these choices are correct
Astronomers expect extrasolar planetary systems to have very different overall properties than those found in our solar system
Indicate whether the statement is true or false
Which of the outer planets has rings?
A. Neptune B. Uranus C. Saturn D. Jupiter E. All of the outer planets have a ring system.