Thermodynamics HW Solutions 871

Thermodynamics HW Solutions 871 - Chapter 11 Fundamentals...

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Unformatted text preview: Chapter 11 Fundamentals of Thermal Radiation 11-23 An incandescent light bulb emits 15% of its energy at wavelengths shorter than 1 μm. The temperature of the filament is to be determined. Assumptions The filament behaves as a black body. Analysis From the Table 11-2 for the fraction of the radiation, we read f λ = 0.15 ⎯ λT = 2445 μmK ⎯→ For the wavelength range of λ 1 = 0.0 μm to λ 2 = 1.0 μm λ = 1 μm ⎯ λT = 2445 μmK ⎯ T = 2445 K ⎯→ ⎯→ 11-9 T=? ...
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