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 danger signal is red because its wavelength is the …………… and therefore it gets ………… the least.

1. least, deviated
2. longest, scattered
3. longest, dispersed
4. least, scattered