The appearance of red colour of the Sun during Sunrise and Sunset is due to
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Scattering of light is responsible for the colors of the sky, with red dominating at sunrise and sunset due to the scattering of shorter wavelengths by atmospheric particles.
The red appearance of the Sun during sunrise and sunset is due to the scattering of light, specifically the scattering of shorter wavelengths, which causes the longer wavelengths (like red) to dominate. Thus, the correct answer is option (2).