Question

define tyndall effect

Answer 1

Tyndall effect:
The scattering of beam of light is called tyndall effect.
It is observed only in case of colloidal solutions.True solution and suspension do not show tyndall effect.

Answer 2

"The Tyndal effect is the dispersing or scattering of light as a light beam passes through a colloid.

An individual suspended particle scatter hence reflecting the light thus making the beam visible. The intensity of dispersal depends on the frequency of light and the density of the particles.

Another way one can look at it is longer wavelength light is transmitted while shorter wavelength light is reflected or somewhat scattered.

"