In the white light of Sun, maximum scattering by the air molecules present in the earth’s atmosphere is for —

1. red colour
2. yellow colour
3. green colour
4. blue colour

To an astronaut in a space-ship, the earth appears —

1. white
2. red
3. blue
4. black

The red colour of the sun at sunrise and sunset is due to which of the following phenomenon ?

1. deviation
2. dispersion
3. both deviation and dispersion
4. scattering