A) the sun is colder at sunrise or at sunset
B) diffraction sends red rays to the earth at these times
C) refraction is responsible for it
D) scattering due to dust particles and air molecules is responsible for it
Correct Answer: D
Solution :
According to Rayleigh's law of scattering, amount of scattering\[\propto \frac{1}{{{\lambda }^{4}}}\]. Red having maximum wavelength suffers minimum scattering and is able to reach straight to the observer. Most of the scattered light goes towards the sky, so the sky appears blue.
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