Question

When sunlight enters into a dark room tiny particles are observed floating in air

Answer 1

Dust particles are found anywhere and everywhere in the surrounding. They are so tiny that they are not visible to the naked eye.

They are in continuous random motion as they are easily carried away by the air.

When sunlight enters into a dark room tiny particles are observed floating in air are dust particles.

As the naked eye cannot see then in the dark, the dust particles are visible due to the light provided by the sunlight when entering the dark room.

Answer 2

it is due to the Tyndall effect