Q.

A surface at temperature T0 Kelvin receives power P by radiation from a small sphere at temperature  T >>T0 and at a distance d. If both T and d are doubled, the power received by the surface will become approximately

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Detailed Solution

P  α   T4d2When T and d are doubled, power received by the surface  P'  α   2T42d2α  4T4d2⇒     P'=4P
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A surface at temperature T0 Kelvin receives power P by radiation from a small sphere at temperature  T >>T0 and at a distance d. If both T and d are doubled, the power received by the surface will become approximately