An incandescent light bulb produces light using a thin tungsten filament (wire) heated to about 5000 K by an electric current that passes through it. A typical filament bas a diameter of 10 μm and a length of 2.0 cm. (a) What is the rate at which heat energy is emitted by the filament? (b) When the current through the filament is turned off, the filament cools as heat is radiated away. Estimate how long it takes the filament to cool 100 K to a final temperature of 4900 K.
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