Why is Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Tyndall Effect**: The Tyndall effect is the scattering of light by particles in a colloid or in very fine suspensions. It occurs when light passes through a colloidal solution, causing the light to scatter in different directions.

2. **Why Colloidal Particles Show the Tyndall Effect**: Colloidal particles are typically of a size that is comparable to the wavelength of visible light (approximately 400 to 700 nanometers). This size allows them to effectively scatter light, which is why the Tyndall effect is observed in colloidal solutions.

3. **Instances of Observing the Tyndall Effect**:
- **Blue Color of the Sky**: The molecules in the atmosphere scatter sunlight, which is why the sky appears blue. This scattering is similar to the Tyndall effect.
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