Question

in a beam of sunlight entering a room ,we sometimes see dust particles moving in a haphazard way in the air .why do these dust particles move?​

Answer 1

Sometimes, when a beam of sunlight enters a room, we can see tiny dust particles suspended in air which are moving rapidly in a very haphazard way. The tiny dust particles move here and there because they are constantly hit by the fast moving particles of air. This zigzag movement of the small particles suspended in the gas is called Brownian motion.

And this effect is called Tyndall effect. It's due to the scattering of sun light....

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Answer 2

This is your answer

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