For electromagnetic radiation of intensity of
what is the rms value of the electric field?
a. 
b. 
c. 
d. 
e. 
a.
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The runoff channels on Mars were most likely formed by
A) melting underground ice. B) catastrophic, but rare flooding C) the annual melting of the polar ice caps. D) glaciers. E) rain that was part of a water cycle.
Does Venus have auroras around its poles, like Earth? Why or why not?
A) Yes, because it is bombarded by charged particles from the Sun. B) No, because its atmosphere is too thick. C) Yes, because strong winds generate light near its poles. D) No, because it lacks a global magnetic field.
An object is moving with constant non-zero velocity in the +x-axis. The position versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.
If two protons are moved 3 times closer together, the electrical force between them is what factor of the original force?