Rayleigh Scattering
Scattering by molecules or aggregates of molecules with dimensions significantly smaller than the wavelength of the radiation is called Rayleigh scattering; its intensity is proportional to the inverse fourth-power of the wavelength, the dimensions of the scattering particles, and the square of the polarizability of the particles. An everyday
manifestation of Rayleigh scattering is the blue color of the sky, which results from the greater scattering of the shorter wavelengths of the visible spectrum.