A flat perfectly black plate of area is maintained first at and later at in a large…
PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Modern Physics · Modern Physics
Problem
A flat perfectly black plate of area 0.20m2 is maintained first at 300K and later at 600K in a large evacuated enclosure whose walls are at a much lower temperature so that heat received back from the surroundings may be neglected.
(i) Write the mathematical expression for the radiant power emitted by the plate at each of the two temperatures.
(ii) Calculate the factor by which the radiant power increases when the temperature of the plate is raised from 300K to 600K.
(iii) Giving reasons based on the temperature dependence in your expression, explain why the increase in power is far greater than the two–fold rise in temperature.