Question: A 2-cm-diameter sphere has a surface temperature of 1000 K emits thermal radiation at a rate of 15 W. What is the emissivity of the

A 2-cm-diameter sphere has a surface temperature of 1000 K emits

A 2-cm-diameter sphere has a surface temperature of 1000 K emits thermal radiation at a rate of 15 W. What is the emissivity of the surface? The Stefan-Boltzmann constant, o, is 5.67 x 10-8 W/mK4

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