Which phenomenon best explains why the sky appears blue during daytime?
Shorter wavelengths of sunlight are scattered more than longer wavelengths
Sunlight is composed of all the colours of the visible spectrum, and each colour has a different wavelength.
As sunlight passes through the atmosphere, gas molecules scatter light of shorter wavelengths, such as blue, much more strongly than light of longer wavelengths, such as red, a process called Rayleigh scattering.
This scattered blue light reaches our eyes from all directions of the sky, making the sky appear blue during the daytime.
Hence, the correct answer is that shorter wavelengths of sunlight are scattered more than longer wavelengths.
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