Problem 15:
Lava has an area of 0.80 m², and emissivity of 1.0, and a temperature of 1450 K. The
temperature of the surroundings is 300 K. What is the rate of heat transfer, from the lava to the
surroundings, due to radiation?
a. 1.0 x 105 W
c. 3.0 x 105 W
d. 4.0 x 105 W
b. 2.0 x 105 W