(i) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.
(ii) 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?

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Solution

(i) Suspended particles in a liquid or a gas move in a random zig-zag motion. This type of motion is known as Brownian motion. Below is the diagram to show the Brownian motion of a particle (like a pollen grain):

(ii) The dust particles we see in a beam of sunlight, move in a haphazard way in the air because they are continuously hit by the fast-moving particles of air.

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Similar questions

When a beam of sunlight enters a room throuth a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases )Y which are moving rapidly in a very haphazard manner.

(a) What could particles X be ?

(b) Name the gas (or mixture of gases) Y.

(d) What is causing the movement of particles X ?

(e) What conclusion doed the existence of this phenomenon give us about the nature of matter ?

Q. The motion of a dust particle in air is an example of -

What conditions do we need to see dust particles in the air?

Q. In Brownian movement or motion the paths of the particles are:

Q. In Brownian movement or motion, the paths of the particle are _________.

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(i) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion. ​(ii) 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?

(i) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.
(ii) 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?