When we look at the sky during the daytime, we mainly see sunlight that has bounced off air molecules and scattered in all directions in the atomsphere. Because blue light scatters more easily than red light, and because the light from the sky is mostly scattered light, the sky appears blue. (If, however, we imagined a world without air, the sky would look dark even in daylight, because there would be no scattered light. On the moon, which has no air to scatter the sunlight, the sky appears black, even in the daytime.)
The sunset looks red, however, due to the opposite effect: We are looking mainly at the sun itself and not scattered light. At sunset, the sun sits near the horizon, so light from the setting sun must travel horizontally to reach our eyes and thus travels through a relatively large amount of air. By the time sunlight reaches us, only the reds are left unscattered.
2007-02-24 13:26:04
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answer #1
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answered by Anonymous
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This is due to Rayleigh Scattering. Oxygen and nitrogen molecules scatter short wavelength light (blue) more than longer wavelengths.
When the sun is low in the sky it has to pass through more atmosphere to reach an observer than at mid-day. As a result, a lot of the blue light has been scattered out of the light received by the observer, so the sun looks redder.
2007-02-24 08:02:51
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answer #2
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answered by Pete WG 4
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the light that is not scattered is able to pass through our atmosphere and reach our eyes in a rather non-interrupted path. The lower frequencies of sunlight (ROY) tend to reach our eyes as we sight directly at the sun during midday. While sunlight consists of the entire range of frequencies of visible light, not all frequencies are equally intense. In fact, sunlight tends to be most rich with yellow light frequencies. For these reasons, the sun appears yellow during midday due to the direct passage of dominant amounts of yellow frequencies through our atmosphere and to our eyes.
As the path which sunlight takes through our atmosphere increases in length, ROYGBIV encounters more and more atmospheric particles. This results in the scattering of greater and greater amounts of yellow light. During sunset hours, the light passing through our atmosphere to our eyes tends to be most concentrated with red and orange frequencies of light. For this reason, the sunsets have a reddish-orange hue. The effect of a red sunset becomes more pronounced if the atmosphere contains more and more particles. The presence of sulfur aerosols (emitted as an industrial pollutant).
2007-02-24 19:26:04
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answer #3
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answered by Anonymous
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When the sun is at an angle to the point of observer, only the red region in the visible part of the electromagnetic spectrum gets "through" to the observer.
The angle at which the light bends is proportional to the wavelength of the light and red light has a longer wavelength than those of the rest of the visible spectrum.
2007-02-24 08:04:16
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answer #4
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answered by wgh 2
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Red sky at night shepherds delight - the sky turns red so you will know what the weather is goin to be like the next day!!! Sorry it's not a very scientific answer, but completely valid none the less!! LOL
2007-02-24 08:03:01
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answer #5
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answered by Anonymous
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At spoil of day and sunset,rays of the daylight ought to commute an stronger area of the ambience than at noon.hence,lots of the blue ordinary is scattered away and the pink ordinary it really is least scattered reaches the observer.for this reason the sky looks reddish at spoil of day and sunset.
2016-12-04 21:43:29
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answer #6
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answered by Anonymous
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The sky turns red at sunset because the sun is at a lower angle thus it is shining through more atmoshere. The color you see is the sunlight reflecting through particles in the air, much like light reflecting through a prism. This is why at sunrise you see a colored sky when the sun is still low.
2007-02-24 07:59:57
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answer #7
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answered by jetfighter 6
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It is due to the fact that the Red wave length is bent more by the atmosphere, also dust and other impurities absorb the blue.
2007-02-24 07:58:32
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answer #8
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answered by Anonymous
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Oooo ooo i know this!!! sacatteriing of blue light!!! i did it in yr 10 science :D
2007-02-24 11:58:01
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answer #9
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answered by rebecca 2
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