An electric current produces
A)
a gravitational field.
B)
an electric field.
C)
a magnetic field.
D)
an electromagnetic field.
E)
a universal field.
C
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Which of the following factors in the simplified Drake equation is least well known?
A) Nhp, the number of habitable planets in our galaxy B) fciv, fraction of life-bearing planets where intelligent civilizations have arisen at any time C) fnow, fraction of civilization-bearing planets that have intelligent civilizations on them now D) flife, fraction of life-bearing habitable planets
A hypothetical atom has four distinct energy states. Assuming all transitions are possible, the number of spectral lines this atom can produce is
A) 5. B) 6. C) 7. D) 8. E) more than 8.
A heavy rock and a light rock of the same size are falling through the air from a tall building. The one that encounters the greatest air resistance is the
C) same for both
In the formation of a cloud, moist air rises and
A) expands. B) cools. C) condenses. D) all of the above E) none of the above