Question

Explain briefly TYNDALL EFFECT.

Answer 1

The Tyndall effect, also known as Tyndall scattering, is light scattering by particles in a colloid or else particles in a very fine suspension. It is named after the 19th-century physicist John Tyndall.

Answer 2

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✒ What is the Tyndall Effect ?

• 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.
• Therefore, it can be used to verify if a given solution is a colloid.
• The intensity of scattered light depends on the density of the colloidal particles as well as the frequency of the incident light.
• When a beam of light passes through a colloid, the colloidal particles present in the solution do not allow the beam to completely pass through.
• The light collides with the colloidal particles and is scattered.

✒ Examples of the Tyndall Effect

1. Milk is a colloid that contains globules of fat and protein. When a beam of light is directed at a glass of milk, the light is scattered. This is a great example of the Tyndall effect.

2. When a torch is switched on in a foggy environment, the path of the light becomes visible. In this scenario, the water droplets in the fog are responsible for the light scattering.

3. Opalescent glass has a bluish appearance when viewed from the side. However, orange-colored light emerges when light is shined through the glass.

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