A body having a surface area of 5.0" cm"...

A body having a surface area of `5.0" cm"^(2)`, radiates 300 J of energy per minute at a temperature of `727^(@)C`. The emissivity of the body is (Stefan.s constant `=5.67xx10^(-8)W//m^(2)//K^(4)`)

0.09

0.18

0.36

0.54

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