A cube at 100C radiates heat at a rate of 80.0 J/s. If its ...

[casperchen82]

A cube at 100C radiates heat at a rate of 80.0 J/s. If its surface temperature is increased to 200C, the rate at which it will now radiate is closest to
 
  A) 160 J/s.
  B) 207 J/s.
  C) 320 J/s.
  D) 640 J/s.
  E) 1280 J/s.

Question 2

A cube at 100.0C radiates heat at a rate of 80.0 J/s. If the length of each side is cut in half, the rate at which it will now radiate is closest to
 
  A) 56.6 J/s.
  B) 40.0 J/s.
  C) 28.3 J/s.
  D) 20.0 J/s.
  E) 10.0 J/s.

[vish98]

Answer to Question 1

B

Answer to Question 2

D