can i know does UV carry energy?and does UV light causes global warming?
153448
UV carries more energy than infrared. UV has the highest frequency. \nUV is not the cause for globalwarming. As the atmosphere gets more and more CO2 it will trap more infrared light coming from earth. CO2 is the cause for globl warming. \nThe infrared radiation from earth is the radiation it emitts as the surface absorbs light from all other frequencies, including UV, although not alot of UV reaches the surface. Instead it is absorbed by the ozonelayer. That means it gets hot up there but that heat (or infrared light) doesn´t make it down to the surface. Instead it is radiated off into space.
262700
Global warming,green house effects,thinning layer of the ozone
197217
I think u r interested in role of carbon in greenhouse effect.The greenhouse effect, is a warming of the Earth's surface and lower atmosphere that tends to intensify with an increase in atmospheric carbon dioxide. \n\nThe atmosphere allows a large percentage of the rays of visible light from the Sun to reach the Earth's surface and heat it. \n\nA part of this energy is reradiated by the Earth's surface in the form of long-wave infrared radiation, much of which is absorbed by molecules of carbon dioxide and water vapour in the atmosphere and which is reflected back to the surface as heat.\n\nThis is roughly analogous to the effect produced by the glass panes of a greenhouse, which transmit sunlight in the visible range but hold in heat. \n\nThe trapping of this infrared radiation causes the Earth's surface and lower atmospheric layers to warm to a higher temperature than would otherwise be the case. \n\nWithout this greenhouse heating, the Earth's average temperature would be only about -73 C (-100 F); even the oceans would be frozen under such conditions. \n\nAlternatively, a "runaway" greenhouse effect like that found on the planet Venus would result in surface temperatures as high as 500 C (932 F). \n\nOwing to the rise in atmospheric carbon dioxide caused by modern industrial societies' widespread combustion of fossil fuels (coal, oil, and natural gas), the greenhouse effect on Earth may be intensified and long-term climatic changes may result. \n\nAn increase in atmospheric concentrations of other trace gases such as chlorofluorocarbons (Freons), nitrous oxide, and methane, due again largely to human activity, may also aggravate greenhouse conditions. \n\nA growing number of scientists have predicted that significant alterations in climate patterns will be seen by the turn of the century. \n\nThey estimate that global average temperatures could increase by as much as 5 C (9 F) by the middle of the 21st century. \n\nSuch global warming would cause the polar ice caps and mountain glaciers to melt rapidly and result in appreciably higher coastal waters. \n\nThe rise in global temperature would also produce new patterns and extremes of drought and rainfall, seriously disrupting food production in certain regions. \n\nOther scientists involved in climatic research maintain that such predictions are overstated, however.
618211
UV can affect DNA from any organism.  \n\nUV (ultraviolet) radiation is the high-energy non-visible radiation in sunlight, beyond the violet end of the visible spectrum (hence the name ultraviolet).  This high-energy radiation can knock DNA molecules out of whack ... what we call a mutation.  \n\nThe difference betwen bacteria (and other single-celled creatures) and multi-cellular creatures is that bacteria will pass this mutation on when they reproduce by division. \n\nIn multicellular organisms, this mutations in the DNA can cause uncontrolled growth of new cells, all with the same damaged DNA.  This is cancer.
840309
I know that different colors are "visible" at different wavelengths.  So, depending on an increase/decrease in energy, you would be at varying wavelengths?
773617
Any energy liberated by a reaction is indeed heating up the planet.\nHowever, the real problem with global waming is the amplification caused by green house gasses, like methane and CO2, wich traps the heat from the sun.  The sun gives about 1300 watt per square metre, over the surface of the planet this is over 10000 times more energy than all the installed power (the sun energy hitting earth is equivalent to 27 gigawatt per person on the whole planet; no one uses that much power). So, doubling our power production would have a negligible effect on global warming, but adding just a bit of gas that traps the huge amount of power that the sun sends will, however, have a huge impact.
537292
No and yes. \n\nWith regards to un-educated and mis-informed rubbish that goverments tell us that global warming is an artifact of human activity on this planet no I do not. Global warming is a topic which for the last thirty years or so has been 'fashionable' to study. If you look it at this way, the Earth is approx 4 to 6 billions years old and we are only studying the past few centuries. To me this is not even a dot on the Earths timescale so how can we possibly deduce mans influence on the climate. The climate of the earth is changing constantly. What we recognise as the four seasons; sping, summer, autumn (fall) and winter have only been in existance for the past few million years!\n\nAlthough some scientists have looked at the recent erosion of the ozone, they fail to see the bigger picture and take into account the varying orbit the planet has around the sun, its tilt and wobble (see link below for info on the Milankovitch Theory). They also fail to recognise in they're studies the gravitational pull of the earths core and the movement of the fluids contained within. Additionally the 'hotspots' or 'solar flares' on the sun are not taken into account when global warming is discussed, of which also effects our climate.
844605
UV is part of the light spectrum (short wave just beyond violet).  It is given off by the sun, welding torches and UV lights.  Cell phones do not give off UV radiation.  While there are UV curable coatings putting one on a cell phone will probably ruin it and accomplish nothing good in the process.  You are probably thinking of microwave radiation (long wavelength compared to light).  A UV curable coating is transparent to this.
280135
Both reasons are correct.  The UV rays have less "stuff" to travel through in the air and atmosphere, so they have a stronger effect.\n\nAlso the snow does have a reflective and intensifying quality that it passes to the UV rays.
435454
I watched a show on the history channel last night and it talked about "darkening" From what I heard it still balances nature. The program said without "darkening" the "global warming" rate would increase 5-10 fold. The whole concept is interesting but I'd need to hear more.\n\nJason
359692
The radiations emitted from the sun and also the earth are usually blocked by layers of atmospheric gases and prevent them from escaping into space.This causes 'GLOBAL WARMING'-due to the reflected radiations.This is also known as 'GREEN HOUSE EFFECT'.
450642
Absolutely.  Interestingly enough, though, there is also such a thing as particle refraction.  This is the pollution particles (mostly sulfates) in the air forming droplets and mixing with clouds.  These smaller particles reflect more light than unpolluted drops, therefore refracting much light and warmth from the earth.  This is referred to as global dimming.  Global dimming actually helps to balance out the global warming.  If we were to somehow end all particle pollution, then the earth would warm at a faster rate.  Without the global warming, the particle pollution would eventually freeze us out.  Therefore, if we end either process of pollution, we must end both or the earth will suffer grave consequences.  If you want more proof of global warming, investigate the hurricane trend of the last few years.  We have had an increase in the frequency of hurricanes because the ocean waters are warmer--check National Geographic, I remember an article in August or September of last year.
539325
In our current case; Yes they are at least somewhat related. They are not by definition, however, related. Global Warming can occur due to a wide range of factors as the Oil companies are so fond of pointing out. They are right to say that Global warming can occur without a change in the Greenhouse gases. It can occur due to fluctuations in the ocean currents, it can occur as a result of an increased solar output from the Sun, or a host of other causes.  In our case when all of the science is reviewed it overwhelmingly supports the model of Global warming being caused directly from mans effect on the levels of Greenhouse Gases. All other natural variations are minor compared to mans influence on Global Warming.\n\nThe science behind Greenhouse Gases; \n\nGreenhouse gases are rather transparent to visible light, but they absorb and scatter IR Light, which is the frequency range of Earths blackbody heat radiation. The Sun shines down through the atmosphere and heats the Earth. The Earth at the same time is always radiating IR blackbody radiation back into space creating a heat balance. Some of the IR light, however, is absorbed and scattered by the organic greenhouse gases. Therefore, some of the heat that would have escaped into space doesn't. This continuous action over a long period of time very gradually adds up until a different new and hotter heat balance is achieved. \n\nSource(s):\n\nHere are some additional websites; \n\nhttp://www.pewclimate.org/global-warming...\n\nhttp://www.ucsusa.org/global_warming/sci
1104794
No.  Plants don't absorb much UV.  Grow lights are designed to emit light in the wavelengths that plants absorb, so get a grow light.\n\nWhat does the visible spectrum have to do with plants?\nPlants must have light to grow and survive in their environment. The plants specifically use light to make their food in a process called photosynthesis. The light is absorbed by the green pigment chlorophyll, which is located in the leaves of the plant. The actual colors in the visible spectrum that the plant absorbs and uses for photosynthesis are red and blue. The plant reflects green light, and that is what we see when we look at a green plant. Green light is not the only reflected light. For instance, far-red light is also reflected. Far-red is just outside the visible light spectrum. It is not visible to the human eye, but can be sensed by the plant. Far-red wavelengths are important to the plant because of the competition factor in nature. A plant can "SEE" when there are other plants close by because of the increase of far-red wavelengths the other plants reflect. This will then signal the plant to make the necessary adjustments within their system to try to outgrow the others around them since they are competing for sunlight and other resources.\n\nhttp://www.florence.ars.usda.gov/kidsonly/middle/mulch3.html
1040095
heat radiation is possible in a vacuum, thats how the suns energy reaches us
250338
I would guess the sun would be the energy in SOLAR powered anything. Solar = sun
336978
It is certainly true that there have been periods in history that have been hotter than it is now before the rise of the combustion engine and heavy deforestation that ultimately lead to the greenhouse effect. Let me say that the 1.2 degrees Celsius increase that we have observed since the rise of the machine and the human effect on the environment is really insufficient to prove what effect of global warming really is. Additionally, the most abundant greenhouse gas is water vapor (making up about 95% of the abundance of all the greenhouse gases). These two facts basically say that there is no support EXPERIMENTALLY for the theory. Yet the theory is correct: with  a build up of greenhouse gases in all the strata of the atmosphere causes infrared light to reflect several more times off of the earth's surface than it normally would, causing a net increase in thermal energy over long periods of time. I am very much a pro-environment scientist, so I can say without bias that the theory is definitely correct, yet we do not currently know what factors (global warming or something else entirely) we can attribute heat changes to, and therefore, we do not know how much global warming will affect us. Only time will really tell...