A black body emissive power is 81 J/m2 sec .It is at 300 K .Another o – McqOptions

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1.	A black body emissive power is 81 J/m2 sec .It is at 300 K .Another one ordinary body emissivity is 0.8 it is at 500 K .then what is the emissive power of ordinary body?
A.	200 J/m2 sec
B.	300 J/m2 sec
C.	400 J/m2 sec
D.	500 J/m2 sec
Answer» E.

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