After long periods of use, a grey spot develops on the inside of a bulb. This is because Options: A . &nbspThe tungsten filament evaporates and collects there B . &nbspThe heat of the bulb scorches the glass at the top C . &nbspDust inside the bulb condenses on the top D . &nbspGlass undergoes a change due to the heat

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

Question

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

Options:

A . The tungsten filament evaporates and collects there

B . The heat of the bulb scorches the glass at the top

C . Dust inside the bulb condenses on the top

D . Glass undergoes a change due to the heat

Answer: Option C

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