Which is the kinetic phenomenon

Options

A. Brownian motion
B. Tyndall effect
C. Both (1) and (2)
D. None of these

Answer

To determine which of the given options represents a kinetic phenomenon, we will analyze both Brownian motion and the Tyndall effect.

### Step-by-Step Solution:

1. **Understanding Brownian Motion**:
- Brownian motion refers to the random or erratic movement of particles suspended in a fluid (liquid or gas). This movement is caused by the continuous bombardment of the colloidal particles by the molecules of the dispersion medium.
- The particles exhibit a zigzag motion due to these collisions.

2. **Kinetic Nature of Brownian Motion**:
- The random movement of particles in Brownian motion is a result of kinetic energy. The collisions between the colloidal particles and the molecules of the dispersion medium are a hallmark of kinetic phenomena.
- Since Brownian motion involves the movement and collisions of particles, it is classified as a kinetic phenomenon.

3. **Understanding the Tyndall Effect**:
- The Tyndall effect describes the scattering of light by colloidal particles. When light passes through a colloid, it is scattered in various directions by the dispersed particles.
- This effect does not involve the movement or collisions of particles; rather, it is a result of the interaction between light and the particles.

4. **Conclusion**:
- Since Brownian motion is a kinetic phenomenon due to the random movement and collisions of particles, while the Tyndall effect does not involve such kinetic activity, the correct answer to the question is:
- **Option 1: Brownian motion is the kinetic phenomenon.**