How do we know that different colors of light have different speeds in a material?
a. Because of measurements by Galileo of the speed of different colors of light.
b. Because different colors reflect at different angles.
c. Because the index of refraction depends on the speed of light in a material, and that index is different for different colors.
d. Because Fizeau's measurements measured different colors of light to have different speeds.
e. Because the colors combine to form white light.
c
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Is the decay ?+ ? p + ?+ allowed?
A) No, because lepton number is not conserved. B) No, because mass is created. C) Yes, because it conserves energy. D) No, because charge is not conserved.
What is an accretion disk?
A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole B) any flattened disk in space, such as the disk of the Milky Way Galaxy C) a stream of gas flowing from one star to its binary companion star D) a disk of material found around every white dwarf in the Milky Way Galaxy
If y = 0.02 sin (30x? 400t) (SI units), the frequency of the wave is
A. 30 Hz. B. 15/? Hz. C. 200/? Hz. D. 400 Hz. E. 800? Hz.
What has to change in the expression F = p / t (which for p = mv is equivalent to Newton's second law) to fit the theory of special relativity?
a. The momentum p has to equal mv, instead of just mv, where is the relativistic adjustment factor. b. The force F has to equal t/p, instead of p/t. c. We have to measure t instead of t. d. The speed v is replaced by c, the speed of light. e. There is no way to reconcile Newton's second law with the theory of special relativity.