Question

$\left(i\right)$ Why does the Sun appear red at sunrise?
$\left(ii\right)$ Name the subjective property of light related to its wavelength.

Answer 1

$\left(i\right)$ During the sunrise the light from the sun has to travel the longest distance of atmosphere to reach the observer. The light travelling from sun loses blue light of short wavelength due to scattering, while the red light of long wavelength is scattered a little. So, it is not lost much. Thus blue light is almost absent in sunlight reaching the observer and only red light reaches us. So the sun is seen red.
$\left(ii\right)$ Colour is the subjective property of light related to its wavelength.