Question

Red colour of sun at the time if sunrise and sunset is because of

Answer 1

$ahoy$
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$during \: sunrise \: and \: sunset \\ the \: distance \: of \: sun \: from \\ that \: particular \: region \: of \: earth \\ increases \: because \: of \: which \: \\ only \: the \: red \: light \: can \: travel \\ easily \: because \: it \: has \: maximum \: \\ wavelength. \: other \: colors \: of \: light \\ are \: scattered \: when \: they \: hit \: \\ small \: particles \: present \: in \: air \: \\ (because \: of \: high \: frequency \\ and \: small \: wavelength.)$


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Answer 2

Sun appears red at sunrise and sunset : At sinrise and sunset, sun is closer to the horizon. The sunlight passes through denser layer of air and covers larger distance before reaching our eyes. Most of the blue light gets scattered. The light that reaches our red. That is why the sun appears red at sunrise. 

At noon, the sun is overhead. The sunlight passes through rares layers of air and covers shorter distance before reaching our eye. So, almost all colours of light are scattered equally. Hence the sun appears white