A spherical body of area A and emissivity e=0.6 is kept inside a perfectly black body. Total heat radiated by the body per second at temperature T is?

The options are

a.) 0.4 sigma AT^4

b.) 0.6 sigma AT^4

c.) 0.8 sigma AT^4

d.) 1 sigma AT^4

I know that according to the Stefan-Boltzmann law that the heat radiated by any body is esigmaAtT^4 but I don't know what difference will it make if we place this body inside a perfectly black body.



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