A star is moving toward Earth at 90 the speed of light. The star ...

[tfester]

A star is moving toward Earth at 90 the speed of light. The star emits light, which moves away from the star at the speed of light. What do Earth-based astronomers measure for the speed of this light?
 
  A) c
  B) 1.9c
  C) 1.2c
  D) 0.98c
  E) 0.95c

Question 2

In the vicinity of what frequency does an object with a temperature of 1000 K radiate the largest amount of power? (c = 3.00  108 m/s,
 
  Wien displacement law constant equals 2.90  10-3 m  K,
   = 5.670  10-8 W/m2  K4)
  A) 1.0  1014 Hz
  B) 8.0  1014 Hz
  C) 2.3  1014 Hz
  D) 6.7  1014 Hz
  E) 4.1  1014 Hz

[janieazgirl]

Answer to Question 1

A

Answer to Question 2

A

[tfester]

Excellent

[juliaf]

Gracias!