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Question

A spherical body of area 300 cm2 has emissive power of 3000 J/m2s. Find the amount of thermal energy radiated by the body in 10 s.

A
1000 J
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B
5000 J
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C
9000 J
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D
900 J
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Solution

The correct option is D 900 J
Given,
Area, A=300 cm2=0.03 m2
Emissive power, E=3000 J/m2s
Time, t=10 s
We know that,
Emissive power, E=QAt
Q=EAt
Q=3000×0.03×10
Q=900 J

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