Physics

Problem

A solid sphere of radius 0.20 m has surface emissivity 0.60 and is at 900 K. It is placed in a large enclosure at 300 K. Neglecting other heat exchanges, how much energy does the sphere radiate in 5 minutes? a)

5.6\times 10^{6}\,\text{J}

8.3\times 10^{5}\,\text{J}

3.3\times 10^{6}\,\text{J}

6.7\times 10^{5}\,\text{J}

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