CAPE Physics Unit 1 · 2007 · Paper 1 · Question Q32
A spherical blackbody of surface area A is at an absolute temperature T_1. It is suspended at the centre of a container whose walls are at temperature T_2.
The NET rate of loss of heat by radiation from the body is given by
- (A)
P = \sigma A T_1^4 - (B)
P = \sigma A T_2^4 - (C)
P = \sigma A (T_1 - T_2)^4 - (D)
P = \sigma A (T_1^4 - T_2^4)
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