by absorbing ultraviolet or bad radiation from the sun ( Rowland‚ 1992‚ p.66 ). This natural umbrella protecting mankind has recently suffered the effects of industrialized society. This " ozone shield is dissipating " and the cause is laid primarily to man - made chemicals ( Bowermaster et al‚ 1990‚ p.27 ). If enough of these man - made chemicals are released‚ "the ozone layer would be weakened to such an extent that it does not filter out the sun ’s invisible and dangerous ultraviolet rays " ( Jones
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Part of the sun’s energy that reaches us on earth is the rays of invisible ultraviolet (UV) light. When UV light rays enter the skin‚ they damage the skin cells‚ causing injuries that can be visible like sunburns‚ or invisible. Some of the injury is fixed‚ but some of the damage adds up year after year. After a long time‚ the built-up damage appears as wrinkles‚ age spots‚ and even skin cancer. Also‚ freckles‚ which occur in people with fair skin‚ are usually due to sun exposure. Freckles are nearly
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1. Wavelength of short ultraviolet radiation is: A. 700-1500 mµ B. 1600-12‚000 mµ C. 0.1-3 mm D. 180-290 mµ 2. Wavelength of long ultraviolet radiation is: A. 700-1500 mµ B. 290-400 mµ C. 180-290 mµ D. 0.1-3 mm 3. What ultraviolet wavelength will produce reticuloendothelial stimulation? A. 2600-2700 Å B. 2700-3000 Å C. 2900-4000 Å D. 2400-2500 Å 4. The magnitude of radiation flux at any particular point of the skin depends upon the: A. Cross-sectional diameter of the
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Study of Water Purification Methods Water is the most essential component of life on Earth. In the United States‚ the average person uses about 75 gallons per day of freshwater. Most of this water is pre-treated in facilities and comes out of the tap clean and ready for drinking‚ a fact many take for granted. If you are camping and hiking you won’t always have access to this source of healthy‚ potable water. Unfortunately‚ many water sources in the wilderness include microorganisms‚ bacteria
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depletion were observed to increase as emissions of halo-carbons increased. CFCs and other contributory substances are referred to as ozone-depleting substances (ODS). Since the ozone layer prevents most harmful UVB wavelengths (280–315 nm) of ultraviolet light (UV light) from passing through the Earth’s atmosphere‚ observed and projected decreases in ozone have generated worldwide concern leading to adoption of the Montreal Protocol that bans the production of CFCs‚ halons‚ and other ozone-depleting
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Solar-Powered: Study Chemical Reaction Rates in Ultraviolet (UV) Beads Alana Brown Forest Trail Middle School Mr. Gorcowski Table of Contents Acknowledgements Page 1 Purpose and Hypothesis Page 2 Introduction and Review Literature Page 3-4 Materials and Procedures Page 5-6 Results Page 7 Conclusions Page 8 Reference List Page 9 Acknowledgements I want to thank my mom for buying
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been described as the "father of both infrared and ultraviolet photography" because of the discovery of electromagnetic radiation beyond the visible spectrum and the development of photographic emulsions. He was the first to intentionally produce photographs with both infrared and ultraviolet radiation. He also coined the slightly surreal glowing appearance of foliage in infrared photographs as “Wood effect”. He identified a very low ultraviolet reflectivity on the moon which he suggested was
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Submitted By: (name) February 16‚ 2011 ABSTRACT Black Light is also referred to as a UV light. A lamp that emits electromagnetic radiation almost exclusively in the soft near ultraviolet range that is only partially visible. Black Light as used to detect money helps us protect from fraud and for our security and theft prevention. This thesis contains everything about Black Light that detects fake money. How to use them‚ how its
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weather. However‚ UVB rays are more intense in the summertime. We cannot see these light rays because ultraviolet rays are invisible. The only way to detect or see an ultraviolet rays is by using a certain satellite‚ however some satellites only detect a small portion of ultraviolet rays. An example of a satellite capable of detecting ultraviolet rays (or radiation) is NASA’s "International Ultraviolet Explorer" which has been used for over 17 years now. A good way to lower the chance of getting skin
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products can lead to health problems such as skin diseases‚ chronic bronchitis‚ nervous system dysfunctions and cancers as well as damaging the environment. Ultraviolet Exposure to ultraviolet (UV) radiation carries a increased risk of skin cancer such as melanoma‚ and of cataracts which are to an extent exposure related. Ultraviolet light may also cause harm indirectly by contributing to an increase in ozone in the troposphere (the air we breathe). Carbon Monoxide Carbon monoxide (CO)‚ an
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