Which of the following continually emits electromagnetic radiation?
A) insects
B) radio antennas
C) red-hot coals
D) all of the above
E) none of the above
Answer: D
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The greenhouse effect is the
a. trapping of infrared radiation by the atmosphere. b. accentuated growth of plants near the equator, compared to other regions. c. capturing of visible and UV radiation from the Sun the atmosphere. d. shielding of life-forms from solar UV radiation by the ozone layer.
Our solar system contains only 65 moons (as of Summer 2007)
Indicate whether the statement is true or false
Which one of the following is true for the surface temperature of a bluish-white star in a constellation as compared to the red star in the same constellation?
A) It is greater. B) It is less. C) It is the same.
If an electron is placed at rest near a bar magnet, the electron will
A. accelerate away from the negative pole of the magnet. B. move in a circular path around the north pole of the magnet. C. not move at all. D. be attracted to the positive pole of the magnet.