Given that our galaxy has a volume of approximately 8 1012 ly3, what is the average distance between civilizations if there are currently 1 million intelligent civilizations in our galaxy?
A) 1,500 ly
B) 200 ly
C) 320 ly
D) 2,800 ly
B
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Which of the following is not one of the three major types of seawater movement?
a. Waves b. Tides c. Currents d. Creep
Motion in a P-wave is
A) side to side. B) transverse. C) longitudinal. D) up and down.
Standing at the shore of a still lake, the reflected view of scenery on the other side of the lake is the view you would see if you were upside down with your eye in the line of sight
A) where it already is. B) at the surface of the water where the light reflects. C) directly beneath you, as far below water level as you are above. D) close to the distant shore. E) none of the above
A star is observed with a surface temperature of 3000 K and a luminosity of 105 times that of the Sun. Based on the H-R diagram shown above, what is the approximate radius of this star?
A) 10 solar radii B) 102 solar radii C) 103 solar radii D) The radius cannot be determined.