A cube a=3.0cm on each side radiates energy at the rate of P=20J//s when its temperature is 727^(@)C and surrounding temperature 27^(@)C. Determine its emissivity.

A cube a=3.0cm on each side radiates energy at the rate of P=20J//s wh

1.	A cube a=3.0cm on each side radiates energy at the rate of P=20J//s when its temperature is 727^(@)C and surrounding temperature 27^(@)C. Determine its emissivity.
Answer» ANSWER :`0.066`