Two lightbulbs have cylindrical filaments much greaterin length than in diameter. The
Chapter 20, Problem 49(choose chapter or problem)
Two lightbulbs have cylindrical filaments much greaterin length than in diameter. The evacuated bulbs areidentical except that one operates at a filament temperatureof 2 100C and the other operates at 2 000C.(a) Find the ratio of the power emitted by the hotterlightbulb to that emitted by the cooler lightbulb.(b) With the bulbs operating at the same respectivetemperatures, the cooler lightbulb is to be altered bymaking its filament thicker so that it emits the samepower as the hotter one. By what factor should theradius of this filament be increased?
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