"the phenomena of scattering of light depends upon the size of the particle ". justify the statement with a suitable explanation

Dear student,

When the light passes through a substance or gas, a part of it is absorbed by its particles and the rest scattered away. Therefore, the process of scattering includes absorption of light by the molecules followed by re-radiation in different directions.

This could be explained as follows with the help of the example :

The air is composed of many tiny particles including dust and water vapour. As the ray of sunlight passes through the air, the shorter blue light waves are reflected and refracted by the particles present in it, while the other coloured light waves being longer are unaffected and are not reflected by the water vapour or dust in the air. Blue, therefore, is scattered the most and therefore the colour of the sky is blue. On the other hand, at sunset or sunrise, the sunrays have to cover large atmospheric distances to reach us and most of the blue light gets scattered and doesn’t reach us. The sky as well as the sun, at sunrise and sunset, therefore appear reddish in colour.

Regards.
 

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