Question

Assertion: In the absence of the atmosphere the sky would appear black.
Reason: Atmosphere scatters the light and hence we get blue colour.
A. Both assertion and reason are correct and Reason is the correct explanation for Assertion.
B. Both assertion and reason are correct and Reason is not the correct explanation for Assertion.
C. Assertion is correct but Reason is incorrect.
D. Both assertion and reason are incorrect.

Answer 1

The above statements are the talking about the phenomenon of scattering of light. Light-exposed atoms or molecules absorb light energy and re-emit light at various intensities in different directions, this process is called ‘Scattering of light’.

Complete answer:
The sky we see is blue because of the fact that when the scattering of light takes place through the atmosphere, the blue colour of the sky is due to scattering of light from the atmosphere. In the lack of atmosphere, there will be nothing present for the light to be scattered by, and hence it will appear to be black instead of the blue we see.
The reason we only see blue colour is because the blue light is scattered more than any other colour by the gas and particles that are present in the atmosphere. Blue light is scattered more than other colours because it travels as shorter, smaller waves

So, we conclude that the both assertion and reason are correct and Reason is the correct explanation for Assertion, i.e., Option A.

Note:
When an astronaut goes outer-space, he no longer sees the blue sky. Instead, he sees pitch black nothingness. This is also due to the reason that there is no atmosphere in outer space to scatter the light.