The sky would appear red instead of blue if

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(C) According to Rayleigh's law of scattering, the intensity of scattered light is inversely proportional to the fourth power of its wavelength $(I \p

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Atmospheric particles scatter red light more than the blue light

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(C) According to Rayleigh's law of scattering, the intensity of scattered light is inversely proportional to the fourth power of its wavelength $(I \propto 1/\lambda^4)$.Currently, blue light has a shorter wavelength than red light, so it is scattered more, making the sky appear blue.If atmospheric particles were to scatter red light more than blue light, the red component of sunlight would reach our eyes from all directions, causing the sky to appear red.

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