Question

what are the characteristics required for materials chosen to make incandescent lamp​

Answer 1

Answer:

The material, which can be used for the filaments of incandescent lamps, must possess the properties of high melting point, low vapour pressure, high resistivity, low temperature coefficient, ductility and sufficient mechanical strength to withstand vibrations during use.

Answer 2

Answer: spectral balance characteristic of the material

Explanation:

Incandescent lamp, any of various devices that produce light by heating a suitable material to a high temperature. When any solid or gas is heated, commonly by combustion or resistance to an electric current, it gives off light of a colour