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The amount of heat radiated pr unit time...

The amount of heat radiated pr unit time, per unit area by perfectly black body at `27^@C` is `(sigma = 5.6 xx 10^(-8) J/m^2 sk^(4))`

A

453.6 `watt/m^3`

B

`17 xx 10(-6) J/m^2 s`

C

`439.3 xx 10^(-8) watt/m^2`

D

None of these

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The correct Answer is:
A
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