Question

In a beam of sunlight entering room we see some dust particles moving in a haphazard way in air . why does these dust particles move?

Answer 1

the dust particles are always moving but v r unable to see them because they r very very very small in size...but when the sunlight comes it makes the dust particles visible...light also contain "PHOTONS" which makes the dust particles move even more quickly when they come in its contact...

Regards

Answer 2

Answer:

THIS IS DUE TO TO A PHENOMENON KNOWN AS TYNDALL EFFECT.

Explanation

. 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.