Question

sodium vapour lamb used here as​

Answer 1

Sodium-vapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination.

Answer 2

Answer:

These lamps are mostly used for street lighting as well as industrial uses. The lamp works by creating an electric arc through vaporized sodium metal. Other materials and gases are used to help start the lamp or control its color.

*) Why do we use sodium Vapour lamp?

Sodium-vapour lamps are good for night-time illumination because of their high efficiency and because the light they produce penetrates mist and fog particularly well. As the bulb warms up, the sodium vapour becomes excited, emitting a characteristic yellow light of wavelength 589 nm.