Question

What characteristic property of light is responsible for the blue colour of the sky?
(A) Interference
(B) Diffraction
(C) Scattering
(D) Dispersion

Answer 1

Hint :In order to solve this question, we are going to first know what process is responsible for the blue colour of sky and why by knowing the concept behind it. Then, after explaining the whole process, the correct option is chosen from the four characteristic properties given above.

Complete Step By Step Answer:
The blue colour of the sky is because of the process of ‘Scattering of light’.
Now in the sky, the sunlight that is actually the white light heads towards the Earth. In the way, various obstacles in the form of the dust particles or many other molecules come, these cause the light to get deviated. Now the red colour has the largest wavelength hence, gets the least scattered and the blue colour is the most scattered. That is why when the light actually reaches the people, the only colour that is the most scattered and can be seen clearly is the blue colour only. Hence, the sky is blue.
Therefore, the characteristic property of light which is responsible for the blue colour of the sky is scattering.
Hence, option (C) is the correct answer.

Note :
The scattering of light is the phenomenon in which the light gets deviated from a small particle or obstacle that comes in its way. The process by which small particles scatter light causing optical phenomena like rainbow, the blue colour of the sky and the halo formation also. The other properties given are responsible for other phenomena of nature.