why the sky appears blue? Explain(class 10)
Answers
- The sky appears blue because of a process known as Raleigh scattering.
- Whenever the white sun's light enters on earth's climate, it is scattered by particles in the atmosphere.
- Although blue seems to have the shortest wavelength, it scattered the most, making the sky look blue.
- Another reason is that when the sunlight enters the Earth's atmosphere and also is spread throughout all places by gas as well as particles.
- Blue light is refracted over other colors so it travels in shorter, small patches.
- The blue colour of the sky is due to the scattering by molecules of gases in atmosphere. The blue colour being scattered more than any other colour.
☆ Scattering : Phenomenon of spreading of light ( diffused reflected light ) caused by minute particles ( dust , smoke , etc .) in the atmosphere.
Explanation:
The molecules of air and other fine particles in the atmosphere have size smaller than the wavelength of visible light. These are more effective in scattering light of shorter wavelengths at the blue end than light of longer wavelengths at the red end. The red light has wavelengths about 1.8 times greater than blue light. Thus , when sunlight passes through the atmosphere, the fine particles in air scatter the blue colour ( shorter wavelengths) more strongly tha red. The scattered blue light enters our eyes . If theeartg had no atmosphere, there would not have been any scattering. Then , the sky would looked dark . The sky appears dark to passengers flying at very high altitudes , as scattering is not prominent at such heights.