CURRENT AFFAIRS

Detailed explanation-1: -The filament of an electric bulb is made of tungsten because it has some amazing properties including the highest melting point (3422oC), lowest vapor pressure, and greatest tensile strength out of all the metals. Because of these It can reach high temperature before melting.

Detailed explanation-2: -Tungsten is used almost exclusively for filament of incandescent lamps because tungsten has a high melting point (3380∘C) and becomes incandescent (i.e., emits light at a high temperature) at 2400K. No worries!

Detailed explanation-3: -Tungsten is used in electric bulb because it has high melting point and it does not oxidize. Thus tungsten filament does not melt even when a large amount of heat is produced due to passage of current through the filament (via heating effect of current).

Detailed explanation-4: -Filament of a bulb is made up of tungsten. Tungsten can become white hot and emit white light for a long time.