Question: Under steady-state operation the surface temperature of a small 20-W incandescent light bulb is 125C when the temperature of the room air and walls is

Under steady-state operation the surface temperature of a small 20-W incandescent light bulb is 125°C when the temperature of the room air and walls is 25°C. Approximating the bulb as a sphere 40 mm in diameter with a surface emissivity of 0.8, what is the rate of heat transfer from the surface of the bulb to the surroundings?

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