(N/A) During sunrise and sunset,the Sun appears reddish,whereas at noon,the Sun appears white.
$1$. At noon,the Sun is overhead,and light travels a relatively shorter distance through the Earth's atmosphere. Consequently,only a small amount of blue and shorter wavelengths are scattered,causing the Sun to appear white.
$2$. During sunrise and sunset,the Sun is near the horizon. Light must travel a much longer distance through the atmosphere to reach the observer. Most of the blue light and shorter wavelengths are scattered away by atmospheric particles,leaving only the longer wavelengths,such as red,to reach our eyes,making the Sun appear reddish.