1.

A metal ball of surface area \[200\ c{{m}^{2}}\] and temperature \[{{527}^{o}}C\] is surrounded by a vessel at \[{{27}^{o}}C\]. If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is \[(\sigma =5.67\times {{10}^{-8}}J/{{m}^{2}}\ -s-{{k}^{4}})\]                                                     [MP PMT/PET 1988]

A.            108 joules approx.             
B.            168 joules approx.
C.            182 joules approx.             
D.            192 joules approx.
Answer» D.            192 joules approx.


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