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After long periods of use a grey spot develops on the...

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After long periods of use, a grey spot develops on the inside of a bulb. This is because

Answer & Solution
Correct Answer: Option C
At high operating temperatures, tungsten evaporates from the filament and gradually forms a gray film on the inside of the bulb. The inert gas atoms collide with the evaporating tungsten, causing some of the tungsten atoms to return to the filament.
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