The colour of the sky is due to

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(B) The blue colour of the sky is due to the $Tyndall$ effect. The colloidal particles present in the atmosphere scatter light of different wavelength

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wavelength of scattered light

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(B) The blue colour of the sky is due to the $Tyndall$ effect. The colloidal particles present in the atmosphere scatter light of different wavelengths in all possible directions. According to $Rayleigh$ scattering,the intensity of scattered light is inversely proportional to the fourth power of its wavelength $(I \propto 1/\lambda^4)$. Since blue light has a shorter wavelength,it is scattered more strongly than other colours.

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