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A black body of emissive power 81 J/m^(2...

A black body of emissive power 81 J/`m^(2)` s when it is at 300 K and ordinary body of emissivity 0.8 when it is at 500 K. what is the emissive power of an ordinary body?

A

`500J//m^2s`

B

`800J//m^2s`

C

`600J//m^2s`

D

`400J//m^2s`

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The correct Answer is:
A
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