A setting Sun appears red due to the
a. scattering of lower frequencies by larger particles in the air.
b. light's longer path through the air at sunset.
c. absorption by smaller particles in the air.
d. lower frequencies of light emitted during sunset.

a. scattering of lower frequencies by larger particles in the air.

b. light's longer path through the air at sunset.

Explanation:

Sun light has to travel several distances through the earth's atmosphere during Sun set and Sun rise. This light gets scattered by air molecules present and the shorter wave length blue gets upwards and red comes down. That is why the sun light appears red in our eyes.

answer: the answer is a

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