Question

Explain Tyndall effect with an example.

Answer 1

1. Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions.
2. When light is passed through a true solution, dissolved particles are too small to deflect the light. However, dispersed particles of a colloid being larger, do deflect light.
3. Tyndall effect is seen due to the scattering of light by the particles of dust and smoke in the air.
4. Example: The Tyndall effect can be observed when a fine beam of light enters a room through a small hole and when light is passed through a solution of milk.