Thermodynamics HW Solutions 882

Thermodynamics HW Solutions 882 - Chapter 11 Fundamentals...

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Chapter 11 Fundamentals of Thermal Radiation 11-44 The variation of emissivity of a tungsten filament with wavelength is given. The average emissivity, absorptivity, and reflectivity of the filament are to be determined for two temperatures. Analysis ( a ) T = 2000 K 066728 . 0 f mK 2000 = K) m)(2000 1 ( 1 1 = ⎯→ = λ μ μλ T The average emissivity of this surface is ε λ λ , μ m 1 0.5 0.15 0.173 = + = + = ) 066728 . 0 1 )( 15 . 0 ( ) 066728 . 0 )( 5 . 0 ( ) 1 ( ) ( 1 1 2 1 ε f f T From Kirchhoff’s law, α == 0.173 (at 2000 K) and
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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