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A metal ball of surface area 200 cm^(2)...

A metal ball of surface area `200 cm^(2)` and temperature `527^(@)C` is surrounded by a vessel at `27^(@)C` . If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is `(sigma = 5.67 xx10^(-8)J//m^(2)-s-k^(4))`

A

108 watts

B

168 watt

C

182 watt

D

192 watt

Text Solution

Verified by Experts

The correct Answer is:
C
`(dQ)/(dt)=sigmaAT^(4)rho`
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NIKITA PUBLICATION-KINETIC THEORY OF GASES & RADIATION -MCQs (Stefans Law of Black Body Radiation)
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  4. A solid sphere cools at the rate of 2.8^(@)C per minute, when its temp...

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  5. Ratio of rate of radiation of heat of body at 227^(@)C to that of the ...

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  14. A black body at a temperature of 227^(@)C radiates heat energy at the ...

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