Which effect is illustrated by the observation that when a beam of sunlight enters a dusty room, then its path becomes visible to us.

State whether the following statements are true or false:

(a) The scattering away of red light makes the sky appear blue during the day time.

(b) The scattering away of blue light makes the sun appear red at sunset.

What colour does the sky appear to an astronaut?

State two effects produced by the scattering of light by the atmosphere.

What is tyndall effect? Explain with an example.