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Why the sky is blue? |
Travel Info Why the sky is blue? Travel Tips Rayleigh's theory concluded that as light traveled from the Sun to an observer, it encountered molecules, mostly of nitrogen and oxygen, in the atmosphere. Rayleigh then calculated a mathematical formula that demonstrated that, even in an atmosphere without smoke and dust, gas molecules like oxygen could redirect sunlight and scatter it in many directions. Sunlight is a form of visible light that contains all of the colors. When it is scattered, it is perceived by the human eye as having a specific color. When sunlight encounters gas molecules in the atmosphere, high frequency blue light is scattered out first. The most intense blues are usually seen between 10:00 a.m. and 3:00 p.m. on cloudless days, if we look at the sky about 45 degrees above the horizon with our with our backs to the Sun. Others Out of the seven colours of which light is made of, blue colour disperses the max... hence the sky appears blue The sky is blue because the nitrogen in the air scatters the blue light out of sunlight. Our sun is a yellow star, so it has slightly yellow light, but it is still pretty close to white light. Sunlight on earth is slightly yellower than it is in space because some of the blue light in sunlight gets scattered out by the presence of nitrogen in the air, making the sky appear blue. So (White light) - (Some Blue light) = (Yellow light) As the sun sets, the sunlight travels through more air, and the nitrogen scatters out more blue light and the sun appears first orange, and then finally red. As the sun starts to set: (White light) - (More Blue light) = (Orange light) and finally as the sun has almost set: (White light) - (Lots of Blue light) = (Red light) Edit Delete Rayleigh scattering (named after Lord Rayleigh) is the scattering of light by particles much smaller than the wavelength of the light. It occurs when light travels in transparent solids and liquids, but is most prominently seen in gases. Rayleigh scattering of sunlight from particles in the atmosphere is one reason light from the sky is blue. http://www.answers.com/rayleigh%20scatte... |
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