Blue colour of the sky is due to

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(D) The blue colour of the sky is due to the scattering of light.According to Rayleigh's law of scattering,the intensity of scattered light is inverse

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scattering of light

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(D) The blue colour of the sky is due to the scattering of light.According to Rayleigh's law of scattering,the intensity of scattered light is inversely proportional to the fourth power of its wavelength,i.e.,$I \propto \frac{1}{\lambda^4}$.Among the visible colours,blue light has a shorter wavelength compared to red light.Because the wavelength of blue light is smaller,it is scattered much more strongly by the atmospheric particles (molecules of air) than other colours.Therefore,the sky appears blue to our eyes.

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