Explain the sodium vapour lamp
Answers
Answer:
-> A sodium vapour lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.
-> Two varieties of such lamps exist: low pressure and high pressure. Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting, such as street lamps, where they are widely used.
[1] High-pressure sodium lamps emit a broader spectrum of light than the low-pressure lamps, but they still have poorer color rendering than other types of lamps.
[2] Low-pressure sodium lamps only give monochromatic yellow light and so inhibit color vision at night.
-> There are two types of Sodiums:-
a) Low Pressure Sodium
b) High Pressure Sodium