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Tyndall Effect

When light is...

Question

When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the scattering of light by milk. This indicates that milk is :

A

pure

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B

colloidal

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C

particle

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D

none of the above

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Solution

The correct option is B colloidal
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.
Milk is a colloid that exhibits the Tyndall effect.

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