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Problem: A standard 100 W (120 V) lightbulb contains a 9.40 cm-long tungsten filament. The high-temperature resistivity of tungsten is 9.0 × 10-7Om. What is the diameter of the filament?

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The rate of heat developed across the light bulb is given by:

P=V2R,

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Problem Details

A standard 100 W (120 V) lightbulb contains a 9.40 cm-long tungsten filament. The high-temperature resistivity of tungsten is 9.0 × 10-7Om. What is the diameter of the filament?

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