Question

what are the small particles what are the small particles that can be seen in a beam of light that entering entering in the dark room

Answer 1

The small particles are very tiny colloidal particles that can be seen due to Tyndall effect when a beam of light enters a dark room.


Hope it helps....

Answer 2

Small particles that can be seen in a beam of light entering a dark room are called COLLOIDAL particles. They are big enough to scatter light and hence you can see the beam of light.
Example:molecules of air, dust, smoke , etc.

This effect is called Tyndall effect

Hope it helps ya