A 7 m diameter spherical ball is known to emit radiation at a rate of 340 W when its surface temperature is 880 K. Determine the average emissivity of the ball at this temperature. 𝜎 = 0.1714 x10-8 W/m2K 4 .
"e = \\frac{P}{\\sigma AT^4}"
"e = \\frac{340}{(0.25\\times 0.1714 \\times 10^{-8} \\times7^2\\times880^4}=0.027"
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