Which statement below correctly describes the relationship between expansion rate and age for the universe?
A) The faster the rate of expansion, the younger the age of the universe.
B) The faster the rate of expansion, the older the age of the universe.
C) Age is independent of the expansion rate.
A
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A ray of light enters an equilateral prism made of material with n = 1.45. What angle of incidence,
will cause the internally refracted ray to be parallel to the base of the prism?
A. 46.5 
B. 30.0
C. 20.2
D. 5.70
E. this cannot happen
Exhibit 5-2
A 4.00-kg block is suspended from the roof of an elevator. A 2.00-kg block is suspended from the 4.00-kg block. The tensions in strings 1 and 2 are labeled 
and 
.
?
?
Use this exhibit to answer the following question(s).
Refer to . When the elevator accelerates downwards with an acceleration of 2.20 m/s2, the magnitudes of 
and 
are
A. 30.4 N; 15.2 N.
B. 39.2 N; 19.6 N.
C. 45.6 N; 15.2 N.
D. 48.0 N; 24.0 N.
E. 72.0 N; 24.0 N.
One phenomenon that demonstrates the particle nature of light is:
a. the photoelectric effect. b. diffraction effects. c. interference effects. d. the prediction by Maxwell's electromagnetic theory.
Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A) 0.82c B) 0.70c C) 0.94c D) 0.35c E) 0.57c