Discussion
The blue colour of the clear sky is caused principally by
Answer: D
Correct answer: scattering that is stronger at short wavelengths
Rayleigh scattering by molecules much smaller than the wavelength varies as the inverse fourth power of wavelength, so blue light is scattered some ten times as strongly as red. The scattered light reaching the eye from all directions is therefore blue, and the direct beam, depleted of blue, reddens as its path through the atmosphere lengthens at sunset.
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