(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?

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Solution

(a) If we see a colloidal solution through a strong ultramicroscope, then we observe that the colloidal particles are in a state of continuous zig-zag motion. This type of motion is known as Brownian motion named after British botanist, Robert Brown.

(b) When a beam of light enters a room, the dust particles can be seen moving in a haphazard manner because they are constantly hit by the fast-moving particles of air. Those tiny dust particles scatter the light ray, that's why we are able to their random motion in the air.

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Q. (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?

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:

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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) 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?