Question

Explain why ? (8) The danger signals ie red
the sky appear blue from
earth dark from
o The
moon-​

Answer 1

• The sky appears blue when the scattering of light takes place through the atmosphere.The blue color of the sky is due to scattering of light from the atmosphere.As there is no atmosphere in space and hence light does not scatter into its constituent colors that is why the sky appears dark instead of blue to an astronaut in space

Answer 2

Answer:

(1) Danger signals are red in color because it is scattered the least by air molecules.  Since the color red has the highest wavelength of all the colors we can see it scattered the least. So, red light is used as a danger signal as it is able to travel the longest distance through the fog, rain, etc.

(2) Sunlight is made up of different colors, but because of the elements in the atmosphere, the colour blue is scattered more efficiently than other colors making the sky appear blue. However, the moon does not have an atmosphere, so light is not scattered, and the sky appears black.

Explanation: