A surface at temperature T0 °K 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 surface will becomes approximately(a) P(b) 2 P(c) 4 P(d) 16 P
sumit kumar , 11 Years ago
Grade Upto college level
2 Answers
Saurabh Koranglekar
Last Activity: 4 Years ago
Dear student
The answer is option d
Regards
Vikas TU
Last Activity: 4 Years ago
The power with which the source radiates: Directly proportional the fourth power of absolute temperature Inversely proportional to the square of distance from the source i.e. P∝T^4 P∝ 1/d^2 P = k T^4/ d^2 When both temp and distance from source are doubled P2 = 4P
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