Q.

In the absence of the earth's atmosphere, sky would appear –

A. blue
B. deep red
C. white
D. black
Answer» D. black
Explanation: Sky appears blue because the tiny particles of the earth's atmosphere scatter the blue colour (short wavelength) of the sunlight more dominantly than other wavelengths. A blue sky is a manifestation of Rayleigh scatter. The sky would appear black in the absence of earth's atmosphere because there would be no particles to scatter the light.
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