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 wattsB. 168 wattC. 182 wattD. 192 watt

A metal ball of surface area `200 cm^(2)` and temperature `527^(@)C` i

1.	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 wattsB. 168 wattC. 182 wattD. 192 watt
Answer» Correct Answer - C `(dQ)/(dt)=sigmaAT^(4)rho`

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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 wattsB. 168 wattC. 182 wattD. 192 watt

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