An observer is moving in space toward a distant star at 200 km/s ...

[D2AR0N]

An observer is moving in space toward a distant star at 200 km/s while the star is moving toward the observer at 400 km/s; the relative velocity being 600 km/s of approach. What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00  105 km/s).
 a. 0.067 increase
  c. 0.20 increase
  b. 0.20 decrease
  d. 0.033 decrease

Question 2

Which best describes a system made up of ice, water, and steam existing together?
 a. absolute zero
  c. ice point
  b. triple point
  d. steam point

[maaaaaaaaaa]

Answer to Question 1

C

Answer to Question 2

B