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Which material is used to prepare the filament of an electric lamp?

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Copper

Constantan

Nichrome

Tungsten

answer is D.

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Detailed Solution

The tungsten is used as the filament of the electric bulb or lamp.
As we know, tungsten has a high melting point that is

3600 K

. And to get yellow-white light from the bulb, we need the filament, which has a high melting point. And if the melting point of the filament is low, then it will break. So that is why we use tungsten because of its high melting point.

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