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Define the term tyndall effect.

Define the term tyndall effect.

Grade:upto college level

1 Answers

Gaurav
askIITians Faculty 164 Points
6 years ago
When an intense converging beam of light is passed through a colloidal solution kept in dark, the path of the beam gets illuminated with a bluish light.
This phenomenon is called Tyndall effect and the illuminated path is known asTyndall cone.
The phenomenon was first observed by Tyndall in 1869.
The Tyndall effect is due to the scattering of light by colloidal particles. Since the dimensions of colloidal particles are comparable to the wavelength of ultraviolet and visible radiations, they scatter these radiations and get illuminated.
Tyndall observed that the zone of scattered light is much larger than the particle itself. This is why colloidal particles look like bright spots when viewed with a microscope at right angles to the beam of light as shown in figure. Thus, Tyndall effect may be defined as the scattering of light by colloidal particles present in a colloidal solution.

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