Give scientific reasons : Tungsten metal is used to make a solenoid type coil in an electric bulb.

Answer: Tungsten has a very high melting point (about 3410 ºC) and high resistivity, so a fine coil of tungsten can be heated to white heat and emit light without melting.

The filament of an electric bulb has to be heated to a very high temperature (about 2500 ºC) to give out light. Tungsten has the highest melting point among metals, so it does not melt at this temperature, and its high resistivity produces a large amount of heat when current flows (\(H = I^2Rt\)), so it glows white-hot.

Tungsten is ductile and can be drawn into a fine wire wound as a solenoid-type coil, which gives a long filament of high resistance in a small space and reduces heat loss. At such high temperatures tungsten would combine with oxygen and burn out, so the bulb is evacuated or filled with an inert gas such as argon or nitrogen to prevent oxidation of the filament.