Question

Brownian motion is a/an :

• A. electrical property
• B. mechanical property
• C. optical property
• D. colligative property

Answer 1

The correct option is B mechanical property

Brownian movement or motion, zigzag, irregular motion exhibited by minute particles of matter when suspended in a fluid.

The effect has been observed in all types of colloidal suspensions (see colloid)—solid-in-liquid, liquid-in-liquid, gas-in-liquid, solid-in-gas, and liquid-in-gas. It is named for the botanist Robert Brown who observed (1827) the movement of plant spores floating in water. The effect, being independent of all external factors, is ascribed to the thermal motion of the molecules of the fluid.

The colloidal particles share the motion of the molecules of the dispersion medium and are in a state of continuous zigzag motion called Browninan movement.

So, Brownian motion is a mechanical property.