Atoms or molecules which are exposed to light absorb light energy and re-emit light in different directions with different intensity. This phenomenon of light is called scattering of light.
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Rayleigh Scattering
Rayleigh scattering named after the nineteenth-century British physicist is the predominantly elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation. For light frequencies well below the resonance frequency of the scattering particle (normal dispersion regime), the amount of scattering is inversely proportional to the fourth power of the wavelength.
Rayleigh scattering of sunlight in Earth's atmosphere causes diffuse sky radiation, which is the reason for the blue color of the daytime and twilight sky, as well as the yellowish to reddish hue of the low Sun.
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20 авг 2019
