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As per Rayleigh's criteria of scattering of light by air molecules the intensity of scattered light is inversely proportional to the forth power of wavelength. AND WE ALSO SAY : Intensity of a wave is proportional to square of its amplitude. Now my doubt is that can I combine these two statements to say that amplitude of scattered light is inversely proportional to square of wavelength of incident light?

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Yes, amplitude of electric field of the Rayleigh scattering radiation from a molecule/air density fluctuation is proportional to square of frequency, and thus to inverse wavelength squared.

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