Question

Why is Tyndall effect shown by colloidal particles?

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Answer 1

Question:

Why is Tyndall effect shown by colloidal particles?

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• 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.

• 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.

For example:

1. The Tyndall effect can be observed when a fine beam of light enters a room through a small hole.
2. When sunlight passes through the canopy of a dense forest.
3. Visible beams of headlights in fog is caused by the Tyndall effect.
4. When a beam of light is directed at the glass of milk, the light is scattered.

Answer 2

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• The 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 and some very fine suspensions as governed by the Rayleigh scattering.

• The intensity of scattered light depends on the density of the colloidal particles as well as the frequency of the incident light.