An innovative physics professor conducts laboratory exercises in the college swimming pool. Suppose that one exercise was the measurement of the degree of polarization by bouncing laser light off a surface of glass. If the glass used has an index of refraction of 1.52, at what angle of incidence will the reflected beam be perfectly polarized? It will help to recall that the index of refraction of water is 1.33.
A. 
B. 
C. 
D. 
B.
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Almost all we know about Mercury has come from:
A) telescopic observations for Earth near greatest elongations. B) radar imaging of its rugged surface. C) the three flybys of Mariner 10. D) the messenger orbiter. E) the Hubble Space Telescope's high resolution images.
A simple series circuit contains a 6.0-? resistor, an ideal 15-V DC power supply, and an 18-H inductor. What the time constant of this circuit?
A) 3.0 s B) 110 s C) 0.33 s D) None of the given answers are correct.
When a gamma ray is emitted from an unstable nucleus,
A) the number of neutrons and the number of protons drop by two. B) the number of neutrons drops by one and the number of protons increases by one. C) the number of protons drops by one and the number of neutrons increases by one. D) there is no change in either the number of neutrons or the number of protons. E) none of the given answers
To date a rock thought to be many millions of years old, you should not use the decay of
A) uranium to lead. B) potassium to argon. C) carbon-14.