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(a) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.)(b) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
(a) The zigzag movement of the small particles suspended in a liquid or a gas is called Brownian motion.
![](/assets/questions/media/145526-44980-1620635842.png)
(b) When a beam of sunlight enters a room, suspended dust particles are seen moving haphazardly. This is because the dust particles are constantly hit by the fast-moving particles of air and due to this remain suspended despite gravity acting on them. This is an example of Brownian motion.
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