What is Rayleigh's scattering?

What is rayleigh scattering?

What is Rayleigh's criterion? .

On decreasing the wavelength of incident light from 8000 Å to 4000 Å. The intensity of the scattered light in Rayleigh scattering will become _________ time the initial scattered intensity.

On decreasing the wavelength of incident light from 8000 Å to 4000 Å. The intensity of the scattered light in Rayleigh scattering will become _________ time the initial scattered intensity.

On decreasing the wavelength of incident light from 8000 Å to 4000 Å. The intensity of the scattered light in Rayleigh scattering will become _________ time the initial scattered intensity.