Suppose that Hubble's constant were 20 kilometers per second per million light-years. How fast would we expect a galaxy 100 million light-years away to be moving? (Assume the motion is due only to Hubble's law.)
A) away from us at 20,000 km/s B) away from us at 200 km/s
C) away from us at 2,000 km/s D) toward us at 2,000 km/s
C
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An object is placed a distance d in front of a plane mirror. The size of the image will be
A) dependent on the distance d. B) half as big as the size of the object. C) twice the size of the object. D) dependent on where you are positioned when you look at the image. E) the same size as the object, independent of the distance d or the position of the observer.
To a reasonable approximation, the density of a nucleus
A) varies unpredictably for different values of Z. B) is independent of the mass number. C) is greater for large-Z nuclei. D) is smaller for large-Z nuclei.
A ray of light enters a pane of glass with an angle of incidence of 
The index of refraction of the glass is 1.48. What is the angle of refraction as the ray emerges from the other side of the pane?
A. 
B. 
C. 
D. 
E. 
Show that the temperature of the re-radiating surface Tr 
FIND
Show that the temperature of the re-radiating surface TR, is
Show that the temperature of the re-radiating surface TR, is
Steady state
The re-radiating surface temperature is uniform
SKETCH
