Question

why the sun appear red during early morning and late evening where are yellow is white during noon explain with reasons

Answer 1

During sunrise and sunset, light has to travel the farthest than during the other parts of the day to reach the human eye. As the distance of travel through the atmosphere increases during dawn and dusk, light is refracted much more than during noon. Thus the colours of the light having shorter wavelengths fade out leaving only the red wavelength that reach our eyes.

Answer 2

During sunrise and sunset, the rays have to travel large distance in the atmosphere. Therefore, light other than red is mostly scattered away leaving behind the reddish color due to which sun and sky appear red