Consider an ideal blackened metal plate that behaves as a perfect blackbody
PHYSICS · Subjective · AP · Physics 2: Algebra-based · Modern Physics · Modern Physics
Problem
Consider an ideal blackened metal plate that behaves as a perfect blackbody.
(i) State the physical law that relates the radiant power emitted per unit surface area of the plate to its absolute temperature.
(ii) Without performing any numerical calculation, explain qualitatively how the radiant power per unit area will change when the temperature of the plate is raised from 400 K to 600 K.
(iii) Three identical such plates are maintained at 350 K, 450 K and 550 K respectively. Arrange the magnitudes of their radiant powers per unit area in ascending order and justify your answer on the basis of the law stated in part (i).