CAPE Physics Unit 1 · 2013 · Paper 1 · Question Q39
A small black sphere has an absolute temperature T_1. It is hung in the centre of an enclosure whose walls are at a higher absolute temperature T_2. The net rate of gain of thermal energy by the sphere is proportional to
- (A)
(T_1)^4 - (B)
(T_2)^4 - (C)
(T_2)^4 - (T_1)^4 - (D)
(T_2 - T_1)^4
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