Question

Mention two reason why tungsten is used for making filament of an electric lamp

Answer 1

1. It has high melting point. Tungustun has melting point of 3422C
2. Its filament not gat separated from electrode.
3. It have high resistivity and high thermal conductivity.

Answer 2

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The melting point and resistivity of tungsten are very high. It does not burn very easy at a high temperature. The electric lamps glow at very high temperatures. Hence, tungsten is mainly used as heating element of electric bulbs.

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