Why is tungsten used to prepare the filament of an incandescent lamp?
Reason for using tungsten filament in an incandescent lamp: (i)It has a high melting point of 3300°C. (ii)It has very high resistivity. (iii)It does not become brittle after being heated at elevated temperature for long. (iv)Tungsten can be drawn into very thin wires suitable for making the coiled coil structure of the filament.