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A spherical body of area A, and emissivi...

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

A

`0.6 sigma AT^4`

B

`0.4 sigma AT^4`

C

`0.8 sigma AT^4`

D

`1.0 sigma AT^4`.

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