Question

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 ?

Answer 1

these dust particles are actually very minute and lightweight. so, they remain suspended in the air and move wherever the air blows them. sincw air is continuously moving, these particles also move continuously.
hope this helps :(

Answer 2

Answer:

THIS IS DUE TO A PHENOMENON KNOWN AS TYNDALL EFFECT.

Explanation:

The Tyndall effect is light scattering by particles in a colloid or in a very fine suspension. Also known as Willis–Tyndall scattering, it is similar to Rayleigh scattering, in that the intensity of the scattered light is inversely proportional to the fourth power of the wavelength, so blue light is scattered much more strongly than red light. An example in everyday life is the blue colour sometimes seen in the smoke emitted by motorcycles, in particular two-stroke machines where the burnt engine oil provides these particles.

Under the Tyndall effect, the longer wavelengths are more transmitted while the shorter wavelengths are more diffusely reflected via scattering. The Tyndall effect is seen when light-scattering particulate matter is dispersed in an otherwise light-transmitting medium, when the diameter of an individual particle is the range of roughly between 40 and 900 nm, i.e. somewhat below or near the wavelengths of visible light (400–750 nm).

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