Question: The tungsten filament described in Problem 12.29 dissipates 75 W in an evacuated spherical light bulb of 75-mm diameter. The bulb is in quiescent air

The tungsten filament described in Problem 12.29 dissipates 75 W in an evacuated spherical light bulb of 75-mm diameter. The bulb is in quiescent air and large surroundings at a temperature of 25°C. The reflectivity of the glass is negligible, while the spectral absorptivity is characterized by the following distribution. What is the steady-state temperature of the glass bulb for a tungsten filament operating at 3000 K?

-az = 1 -a =1 2 = 0.1 0.1 0 0.4 1.

-az = 1 -a =1 2 = 0.1 0.1 0 0.4 1. aum)

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