Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be
A) F.
B) 2 F.
C) F/2.
D) F/4.
E) none of the above
Answer: C
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When a vapor condenses,
A) the temperature of the substance increases. B) the temperature of the substance decreases. C) heat energy leaves the substance. D) heat energy enters the substance.
If Mars had a thicker atmosphere with a strong greenhouse effect, the outer boundary of the Sun's habitable zone would lie
A) roughly halfway between the orbit of the Earth and Mars B) just within the orbit of Mars C) roughly halfway between the orbit of Mars and Jupiter D) just beyond the orbit of Mars
If the polarizing angle (the angle at which reflected light is completely plane polarized) of a flat piece of sapphire is 60.5°, what is its index of refraction?
a. 1.97 b. 1.77 c. 1.59 d. 2.36 e. 1.82
What is "stimulated emission"?
a. The interaction of a photon with an excited atom to cause it to emit another photon of the same wavelength. b. Emission in response to an electric discharge through a gas instead of just random light emission. c. Any excitation of atoms that later results in photons being given off by a substance. d. Stimulation of the random action of electrons and photons creating scattered emission of light. e. Emission of photons without requiring electron shell jumps.