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The net radiating power of a 1500 C glowing spherical bulb is 14.6 W in a 20 C room. The emissivity of the bulb is

The net radiating power of a 1500 C glowing spherical bulb is 14.6 W in a 20 C room. The emissivity of the bulb is 0.15. What is the radius of the bulb in mm? Answer in 3 significant figures

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