Question

Brownian motion is observed when looking at smoke particles in air using a microscope. What causes the smoke particles to move at random?
A Smoke particles are hit by air molecules.
B Smoke particles are moved by convection currents in the air.
C Smoke particles have different weights and fall at different speeds.
D Smoke particles hit the walls of the container.

Answer 1

I think so option A is correct....

Answer 2

Option A is the correct one.