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An old light bulb, plugged into a household outlet, draws only 45.8 W, rather than its original 60 W, due to evaporative thinning of its

An old light bulb, plugged into a household outlet, draws only 45.8 W, rather than its original 60 W, due to evaporative thinning of its filament. By what factor is its diameter reduced, assuming uniform thinning along its length? Neglect any effects caused by temperature differences.

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