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Question

The emissive power of a blackbody at T=300K is 100W/m2. Consider a body B of area A=10m2 coefficient of reflectivity r=0.3 and coefficient of transmission t=0.5. Its temperature is 300K. Then which of the following is correct?

A
The emissive power of B is 20 W/m2
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B
The emissive power of B is 200 W/m2
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C
The power emitted by B is 100 Watts
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D
The emissivity of B is 0.3
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Solution

The correct option is A The emissive power of B is 20 W/m2
Emissivity of body B, e=0.2 (Since e=a and a=(1rt)=0.2)
Emissive power of body B, E=(100)(0.2)=20W/m2
Power emitted =e.A=20×10=200Watts

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