After long periods of use, a grey spot develops on the inside of a bul – McqOptions

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1.	After long periods of use, a grey spot develops on the inside of a bulb. This is because
A.	he tungsten filament evaporates and collects there
B.	he heat of the bulb scorches the glass at the top
C.	ust inside the bulb condenses on the top
D.	lass undergoes a change due to the heat
Answer» D. lass undergoes a change due to the heat

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