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Question: to determine the emissivity of the surface ofa copper surface...

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To determine the emissivity of the surface of.a copper surface, a 4-cm diameter copper sphere with an embedded heating element was placed inside a large evac- ulated vacuum chamber. To maintain a surface temperature of 200 °C, with the surroundings at 20 °C, it was found that the power supply to the heating element was 1.2 W. Estimate the emissivity of the surface of the sphere. 1-3 Evacuated chamber Ambient air at 20 °C 200 °C 20°C

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