Why shorter wavelengths are easily scattered than longer wavelengths ? Please provide details necessary details as well.

Oxygen and nitrogen in the atmosphere causes all colors of light to scatter. But because the shorter end of the visible spectrum is closer in size to oxygen and nitrogen atoms, they interact more and are scattered to a higher degree. If only the shortest visible light was scattered, the sky would look more violet than blue. But the sky blue color you see is actually of a mixture that includes green, yellow, orange, and red in decreasing intensity. Below is a graph showing the amount of rayleigh scattering by color:

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