Question

A hot metal ball is hung in an oven that is maintained at 700 K; and it cools. When the temperature of the ball is 900 K, it is losing heat at a rate of 0.10 J/min. At what rate will the ball loose heat when the ball reaches 800 K? Assume that the emissivity of the ball does not change appreciably with temperature.
(a) 0.1 J/min (c) 0.4 J/min (e) 0.04 J/min (b) 0.2 J/min (d) 0.6 J/min​

Answer 1

option b) 0.2J

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Answer 2

$\fcolorbox{red}{yellow}{(e) 0.04 J/min}$

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