A black body of mass .0.10 g is kept in a black enclosure or temperature 27^(@)C. The temperature of the body is 127^(@)Cand the area of the emittimg surface in 10^(-3) m^(2). If its specific heat capacity is 420 J kg^(-1)k^(-1) find the rate of cooling of the body . sigma = 5.67xx10^(-8)Wm^(-2)K^(-4).

A black body of mass .0.10 g is kept in a black enclosure or temperatu

1.	A black body of mass .0.10 g is kept in a black enclosure or temperature 27^(@)C. The temperature of the body is 127^(@)Cand the area of the emittimg surface in 10^(-3) m^(2). If its specific heat capacity is 420 J kg^(-1)k^(-1) find the rate of cooling of the body . sigma = 5.67xx10^(-8)Wm^(-2)K^(-4).
Answer» Solution :`(dT//dt)=sigmaA(T_(4)-T_(0)^(4))//mc=5.67xx10^(-8)xx10^(-3)(400^(4)-300^(4))0.010xx420=0.23` K/s