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Video Example : Tyndall effect

Tyndall effect

RELATED WORDS

  • Tyndall effect
  • Rayleigh scattering
  • Colloidal mixtures
  • Suspensions
  • Scattering

Definition of Tyndall effect

The Tyndall effect is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible. The amount of scattering depends on the frequency of the light and density of the particles

More About Tyndall effect

  • Tyndall effect is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light
  • Under the Tyndall effect, the longer-wavelength light is more transmitted while the shorter-wavelength light is more reflected via scattering
  • An analogy to this wavelength dependency is that long wave electromagnetic waves such as radio waves are able to pass through the walls of buildings, while shortwave electromagnetic waves such as light waves are stopped and reflected by the walls
  • The Tyndall effect is seen when light-scattering particulate-matter is dispersed in an otherwise-light-transmitting medium, when the cross-section of an individual particulate is the range of roughly between 40 and 900 nanometers
  • Tyndall effect is particularly applicable to colloidal mixtures and suspensions; for example, the Tyndall effect is used commercially to determine the size and density of particles in aerosols and other colloidal matter
  • The individual suspension particles scatter and reflect light, making the beam visible
  • The amount of scattering depends on the frequency of the light and density of the particles
  • The visible beam of headlights in fog is caused by the Tyndall effect. The water droplets scatter the light, making the headlight beams visible
  • It is often seen from the dust in the air when sunlight comes in through a window, or comes down through holes in clouds
  • It is seen when headlight beams are visible on foggy nights and in most X-File episodes when Moulder and Sculley check out some dark place with flashlights
  • The X-Files is an American science fiction horror drama television series created by Chris Carter
  • In liquids the Tyndall effect can be easily seen by using a laser pointer. If you dilute milk to where it is almost clear, or if you have any type of sol, such as colloidal silver, then the beam of the laser can be easily seen as it travels through the liquid

Applications:

  • Tyndall effect is easily observed when a fine beam of light enter a room through a small hole
  • Tyndall effect happens because of scattering of light by dust and smoke in the air
  • Tyndall effect can be observed when sunlight passes through a canopy of dense forest. In the forest, mist contains tiny droplets of water which act as colloidal particles dispersed in air