About how many stars are visible to the naked eye on a clear, dark night away from city lights?
A) several million B) a few dozen
C) a couple thousand D) a few hundred billion
C
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The main asteroid belt lies between the orbits of ________.
A. Earth and Mars B. Venus and Earth C. Mars and Jupiter D. Saturn and Jupiter E. Pluto and the Oort cloud
COHESIVE FORCES are
A) repulsive forces between unlike molecules. B) repulsive forces between like molecules. C) attractive forces between unlike molecules. D) attractive forces between like molecules.
For an unpolarized EM wave, the electric field direction is
A. perpendicular to the magnetic field direction. B. parallel to the magnetic field direction. C. perpendicular to the direction of wave propagation, but randomly oriented with respect to the magnetic field direction. D. parallel to the direction of wave propagation.
About how long is the solar cycle (evidenced by the polarity of the Sun's magnetic field)?
A. 3 years B. 22 years C. 5 days D. 11 years