An astronomer observes electromagnetic waves emitted by oxygen atoms in a distant galaxy that have a frequency of 5.710 × 10^14 hz. in the laboratory on earth, oxygen atoms emit waves that have a frequency of 5.841 × 10^14 hz. determine the relative velocity of the galaxy with respect to the astronomer on the earth. note: the speed of light is 2.9979 × 108 m/s.

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.