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An old lightbulb draws only 52.4 W, rather than its original 78.4 W, due to evaporative thinning of its filament. By what factor is its

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An old lightbulb draws only 52.4 W, rather than its original 78.4 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. Equations: R= PL 7, A = , P =

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