Consider the metallic surface of Example 12.7. Additional

Chapter , Problem 12.37

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Consider the metallic surface of Example 12.7. Additional measurements of the spectral, hemispherical emissivity yield a spectral distribution which may be approximated as follows: (a) Determine corresponding values of the total, hemispherical emissivity and the total emissive power E at 2000 K. (b) Plot the emissivity as a function of temperature for 500 T 3000 K. Explain the variation.

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