After long periods of use , a gray spot develops on the inside of a bulb, this is because

9th-class-result-2022

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After long periods of use , a gray spot develops on the inside of a bulb, this is because

Incorrect

The heat of the bulb scorches the glass at the top

Incorrect

Dust inside he bub condenses on the top

Incorrect

Glass undergoes a change dew to the heat

Correct

The tungsten filament evaporates and collects there

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