Question:
139 A black metal foil is warmed by radiation from a small
Last updated: 6/9/2023
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139 A black metal foil is warmed by radiation from a small sphere at temperature T and at a distance d where surrounding temperature is T It is found that the power received by the foil is P If both the temperature and the distance are doubled the power received by the foil will be Assume T Tol 1 16P 2 4P