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A metal cube with each side 3 cm long em...

A metal cube with each side 3 cm long emits 0.27 kcal in 100s. Then its emissive power is

A

1 kcal/`sm^(2)`

B

1.5 kcal/`sm^(2)`

C

0.5 kcal/`sm^(2)`

D

3.5kcal/`sm^(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`E=((theta)/(At))=(0.27)/(6xx1^(2)xx100)`
`=(0.27)/(6xx9xx10^(-4)xx100)=0.5`
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NIKITA PUBLICATION-KINETIC THEORY OF GASES & RADIATION -MCQs (Perfectly black body, emmissive power and emmissivity)
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