A bulb’s brightness gradually decreases over its period of use mainly because of

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1. A bulb’s brightness gradually decreases over its period of use mainly because of?

Gradual evaporation of metal from the hot filament

A decrease in the bulb’s electrical resistance over time

A gradual decrease in the electric supply reaching the bulb

None of the above

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The tungsten filament slowly evaporates at its very high operating temperature, thinning over time and depositing a dark coating inside the glass, which dims the bulb.