in a beam of sunlight entering a room ,we can see some dust partiles moving in haphazard way in the air why do these dust particles move

Open in App

Solution

Dust particles in air form a colloid.The particles of colloid are always in motion but the random motion of dust particles is called Brownian motion which is due to the collisions of the dust particles with themselves and particles of the surrounding medium.

Suggest Corrections

Similar questions

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?

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

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 ?

Why do we often sneeze when we inhale a lot of dust-laden air?

Q. The sky appears blue because some of the blue component of sunlight is scattered by:
(a) gas molecules present in air
(b) dust particles present in air
(c) water droplets suspended in air
(d) soot particles present in air

Join BYJU'S Learning Program