Q 1270234116.     A spherical body of area A, and emissivity `e=0.6` is a black body . What is the rate at which energy is radiated per second at temperature `T `.

A

`0.6 sigma A T^4`

B

`0.4 sigma A T^4`

C

`0.8 sigma A T^4`

D

`1.0 sigma A T^4`

HINT

Stefan's Boltzmann Law.
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