Light sources

  • Created by: izzy
  • Created on: 07-06-13 15:05

Vapour lamps and discharge tubes produce light with a dominant colour. For example, the sodium vapour lamp produces a yellow/orange glow, which is due to light of wavelength 590nm. Other wavelengths of light are also emitted from a sodium vapour lamp but the colour due to light of wavelength 590nm is much more intense that any other colour. A sodium vapour lamp is in effect a monochromatic light soucre, because its spectrum is dominated by light of a certain colour.

Lights from a filament lamp or from the Sun is composed of the colours of the spectrum and therfore covers a continuous range of wavelengths from about 350nm to about 650nm. If a beam of white light is directed at a colour filter, the light from the filter is a particular colour because it contains a much narrower range of wavelengths than white light does.

Light from a laser:

  • Laser light is highly monochromatic, which means we can specify its wavelength to within a nanometre. The wavelength depends on the




I have a lot of light sources in my car. I have a Toyota Tundra, and I like going off-road with it. I need a lot of illumination because I often ride while dark off-road, so it is essential to have a good vision. I bought all my lights from*****-light/. Most of all, I enjoy the LED *****s in the car's interior. It makes the car look so great. I like that I can change the colors of the lights using the app on my phone, which is very convenient because I always change the colors depending on my mood.

Similar Physics resources:

See all Physics resources »See all Waves resources »