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CGP EDU Academic Team
Published on: September 12, 2026
Blackened metal foil receives heat from a heated sphere placed at a distance r from it. It is found that foil receives power P. If the temperature and the distance of the sphere are doubled, then the power received by the foil will be-
Text Solution
Verified by ExpertsThe correct answer is:
D
Let P be the emissive power, T be the absolute temperature of body and 
be the
temperature of surroundings.
According to Stefan's-Boltzmann's law, emissive power is
Also Power of the radiation is inversely proportional to square of distance
Combining both, we get
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