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Introductory Physics Homework Help
Radiation - finding emissivity of a sphere
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[QUOTE="JoeyBob, post: 6466306, member: 684467"] [B]Homework Statement:[/B] see attached [B]Relevant Equations:[/B] dQ/dt = Ae(5.67*10^-8)*T^4 So using the above equation, e=dQ/dt / (A*5.67E-8*303.8^4) The surface area of a sphere is 4(pi)r^2 and I get 136.8478 m^2. dQ/dt would be the net radiation (I think? Its in the correct units), 1074W. Plugging everything in I get 0.01625, but the answer is 0.0524. Now as I was writing this I figured out how to do it by trial and error but am a bit confused. So apparently the surrounding air is decreasing the net radiation? Is that because its of a lower temperature? So if the air was hotter would I add it instead of subtracting it? Below is the equation I used to solve. dQ/dt = SA * constant * e * (T of sphere) ^4 - SA * constant * e * (T of air) ^4 [/QUOTE]
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Radiation - finding emissivity of a sphere
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