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Q54
(CISF/2022)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
The blue colour of the sky and the reddening of the Sun at sunrise and sunset are caused due to the phenomenon of :
Result
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D
Explanation
The blue colour of the sky and the reddening of the Sun at sunrise and sunset are caused by the scattering of light by molecules of air and other fine particles in the atmosphere. This phenomenon is known as Rayleigh scattering.
- Blue Sky: Molecules in the atmosphere are smaller than the wavelength of visible light. They are more effective in scattering light of shorter wavelengths (blue/violet) than longer wavelengths (red). Thus, the sky appears blue.
- Reddening of the Sun: At sunrise and sunset, sunlight travels through a thicker layer of the atmosphere. Most of the blue light is scattered away before reaching our eyes, leaving the longer-wavelength red and orange light to pass through.
The intensity of scattered light is inversely proportional to the fourth power of its wavelength (I ∝ 1/λ4).
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