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Crepuscular rays - Wikipedia, the free encyclopedia The rays of the second and third types, in some cases, may extend across the sky and appear to converge at the antisolar point, which is the point on the sky sphere directly opposite the sun, and they are called anticrepuscular rays. Crepuscular rays, in atmospheric optics, also known as sun rays, are rays of sunlight that appear to radiate from a single point in the sky. Crepuscular rays are usually red or yellow in appearance because the atmosphere acts as a giant lens, refracting low sunset rays into long curved paths passing through up to 40 times as much air than the rays from a high midday sun. en.wikipedia.org /wiki/Crepuscular_rays   (325 words)

Crepuscular - Wikipedia, the free encyclopedia For the atmospheric optical effect, see crepuscular rays. Crepuscular is thus in contrast with diurnal and nocturnal. Crepuscular is a term used to describe animals that are primarily active during the twilight. en.wikipedia.org /wiki/Crepuscular   (169 words)

Alpha particle - Wikipedia, the free encyclopedia Alpha particles or alpha rays (named after the first letter in the greek alphabet) are a form of particle radiation which are highly ionizing and have low penetration. The physicist Ernest Rutherford famously used alpha particles to infer that Lord Kelvin's "plum pudding" model of the atom was fundamentally flawed. He then aimed alpha particles at the foil, hypothesizing that, assuming the "plum pudding" model of the atom was correct, the positively charged alpha particles would be only slightly deflected, if at all, by the dispersed positive charge predicted. en.wikipedia.org /wiki/Alpha_particle   (744 words)

MSN Encarta - Search View - Radioactivity In an electric field the path of the beta particles is greatly deflected toward the positive electric pole, that of the alpha particles to a lesser extent toward the negative pole, and gamma rays are not deflected at all. Unlike alpha particles, however, beta particles are emitted at many different speeds, and beta emitters must be distinguished from one another through the existence of the characteristic maximum and average speeds of their beta particles. The emission of gamma rays is a compensation by the atomic nucleus for the unstable state that follows alpha and beta processes in the nucleus. encarta.msn.com /text_761569327__1/Radioactivity.html   (3103 words)

Beta Ray Bill - Wikipedia, the free encyclopedia Beta Ray Bill's race, the Korbinites, once lived near the core of an unnamed galaxy - until, due to the machinations of Surtur, the galactic core exploded. Beta Ray Bill is a fictional alien in the Marvel Universe created by Walt Simonson as a brief rival, then friend and ally to Thor. As Ashta began to consume the planet, Bill attacked him without success, even as the image of Ashta began to twist and warp into the form and name to which he was known to the people of Earth as Stormbreaker "whispered" what the Asgardians knew of Ashta, or rather Galactus, to him. en.wikipedia.org /wiki/Stormbreaker:_The_Saga_of_Beta_Ray_Bill   (1660 words)

AllRefer.com - ultraviolet radiation (Physics) - Encyclopedia Vitamin D is produced by the action of ultraviolet radiation on ergosterol, a substance present in the human skin and in some lower organisms (e.g., yeast), and treatment or prevention of rickets often includes exposure of the body to natural or artificial ultraviolet light. Ultraviolet radiation can be detected by the fluorescence it induces in certain substances. The long-wavelength, "soft" ultraviolet radiation, lying just outside the visible spectrum, is often referred to as black light; low intensity sources of this radiation are often used in mineral prospecting and in conjunction with bright-colored fluorescent pigments to produce unusual lighting effects. reference.allrefer.com /encyclopedia/U/ultravio.html   (1660 words)

Tanning Ultraviolet rays destroy plants, cause cataracts (a common form of blindness), lead to the development of skin cancer and cause premature aging of the skin. The sun is not the only source of ultraviolet rays. Other dangerous rays such as ultraviolet light are only partially blocked by the ozone layer. www.capederm.com /info_tanning.htm   (1660 words)

UV Light References Ultraviolet rays with wavelengths shorter than 300 nm are effective in killing bacteria and viruses. Physicians once used sun lamps that produce these rays to treat rickets…the lamps are used today to treat some skin disorders such as acne and psoriasis. A very important attribute of UV rays…is their ability to kill bacteria. www.americanairandwater.com /uv_facts/uv_sources.htm   (1660 words)

Crepuscular Rays: sun rays converging on the horizon Crepuscular rays are often red or yellow in appearance because blue light from the sun is selectively scattered out of the beam by air molecules. Crepuscular rays appear to diverge outward from the setting sun, and are visible only when the atmosphere contains enough haze or dust particles so that sunlight in unshadowed areas can be scattered toward the observer. Light rays scattered by dust and haze occasionally appear to converge toward the "antisolar" point, (the location on the horizon opposite the point where the sun is setting). ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/opt/air/crp.rxml   (229 words)

Ultraviolet Ultraviolet exposure can also damage and kill plants. Ultraviolet waves are used to identify materials by the glow or fluorescence under them. Ultraviolet waves are effective in killing bacteria and viruses. www.smgaels.org /physics/uv_1.htm   (229 words)

Ultraviolet Rays Ultraviolet radiation is divided into three components: UV-A, UV-B, and UV-C. Because most UV-C radiation is absorbed by the earth's atmosphere, it's the UV-A and UV-B rays that are of concern when protecting the eyes and skin. Ultraviolet rays are invisible light waves from the sun that carry more energy than visible light. Ultraviolet rays reach the eyes directly from the sun, as well as by reflection from the ground, particularly from water, snow, and sand. www.visionrx.com /library/enc/enc_urays.asp   (229 words)

Crepuscular Rays Crepuscular rays are caused by small airborne particles of dust or tiny droplets of water or even by the molecules themselves which scatter sun- or moonlight. Crepuscular rays are parallel columns of sunlit air looking as if they would diverge because of perspective effects. Crepuscular rays sometimes stretch across the whole sky and seem to converge in the antisolar point. www.engl.paraselene.de /html/crepuscular_rays.html   (106 words)

Rutherford While with X rays a strong impression is produced on a photographic plate in a few minutes or even by a single discharge, a day’s exposure to the uranium rays is required to produce a well-marked action, even though the uranium compound, enveloped in black paper, is placed close to the plate. When beta rays, or cathode rays, are stopped in matter, they give up their negative charge, and the quantity of negative electricity communicated to the plate is a measure of the quantity of electricity carried by the absorbed particles. From observations of the ionisation produced in gases by the alpha and beta rays Strutt in 1901 suggested that the alpha rays might be analogous to the canal rays produced in a vacuum tube, and thus might consist of positively charged particles projected with great velocity. www.udayton.edu /~hume/Rutherford/rutherford.htm   (6027 words)

UV Rays and SPF - AllAboutVision.com A globally used index measures the amount of solar ultraviolet rays that are reaching the surface of the earth. Ultraviolet (UV) radiation consists of invisible rays from the sun. Fashion aside, sunglasses serve a true function — protecting eyes from the harmful rays produced by the sun. www.allaboutvision.com /sunglasses/spf.htm   (6027 words)

Ultra Violet Rays These rays penetrate the epidermis and activate the melanocyte cells that produce melanin which, in turn, results in a darker complexion or tan. The UVC rays are the shortest of the Ultra Violet rays. Together with UVB'S, they cause real damage, killing skin cells, dilating blood vessels to produce a reddish skin or sunburn and destroying the vitamins in the skin causing the connective tissue to be destroyed. www.opotion.com /pages/uv-rays.html   (6027 words)

Ultraviolet Light, As Used in Fly Control, Trap Fruit Flies The use of ultraviolet rays has been a major integrated pest management tool in eliminating certain flying insect pests, fruit flies, drain flies (or Moth Fly,) house flies in commercial kitchens, restaurants, lounges, hospitals and other structures. The Exocutor Ultraviolet Fly Zapper and Insectaflash Ultraviolet Fly Zapper are excellent zappers; for areas that are hosed down regularly or where moist conditions are present the Splashproof Ultraviolet Fly Zapper is needed. When flies see ultraviolet light, they are naturally lured in the direction of the source of UV rays. www.pestproducts.com /ultraviolet.htm   (6027 words)

Ultraviolet Lamp for Ultraviolet Rays Applications Applications to build environmental equipment through the use of Ultraviolet rays, in conjunction with photo-catalytic reactions to decompose toxic substances into non-harmful components, are attracting attention within the industry as well. Ultraviolet rays can also be used in the detection of chemical substances and the analysis of human genomes. Ultraviolet rays has been widely used for erasing EPROMs (Electrically Programmable Read Only Memory), i.e. www.marubeni-sunnyvale.com /ultraviolet-rays.html   (6027 words)

Marvel Directory Beta Ray Bill had won the right to Thor's hammer, but he was torn between his need for such a powerful weapon to defend his people and his guilt over depriving Thor of the weapon he was meant to bear. Beta Ray Billproved to be the victor in the ensuing battle, but refused to kill Thor, whom he regarded as a noble adversary. Beta Ray Bill was the only one of the candidates to survive this process, and so it was that he became the guardian. www.marveldirectory.com /individuals/b/betaraythor.htm   (1650 words)

Dirty Bomb - Bomb Detector - Radiation Detection of Gamma Beta X-Ray for $159 X rays are commonly used by physicians to examine parts of the body such as bones and teeth. One important difference is their origin, as gamma rays originate in the nucleus, and X rays originate in the electron field which surrounds the nucleus. X ray radiation exposure is measured in units of rad (radiation absorbed dose). www.dirtybombdetector.com /radiations.htm   (2122 words)

Introduction to Atomic Reactions Alpha particles are made of a particle that is identical to the nuclei of a helium 4 atom, having two protons and two neutrons, except that the alpha particle is moving fast, 1/10 the speed of light. So Alpha radiation is the most deadly when ingested into the body because when the alpha emitting particles are in the actual tissues of the body, there is no dead skin (the epidermal layers of the skin) to stop the alpha rays before it reaches sensitive tissue. It is fortunate that alpha radiation is relatively harmless when coming from external sources, outside of the body, because alpha radiation has the greatest capacity to ionize matter and cause damage to the body. www.creation-science-prophecy.com /intro-atomic.htm   (2465 words)

BIOdotEDU Rays that had many of the properties of alpha rays were also being seen in the cathode ray tubes used to discover electrons. If the alpha rays were first passed through a narrow slit, and then allowed to travel through a vacuum, they formed a clear, crisp rectangular outline on a detecting device at the other end. When these lighter rays were deflected in a magnetic field the smallest particles found had the mass of a hydrogen ion and one positive charge. www.brooklyn.cuny.edu /bc/ahp/LAD/C3/C3_Protons.html   (1023 words)

RADIOACTIVITY-RADIOACTIVE RAYS-ALPHA RAYS-BETA RAYS-GAMMA RAYS-PROPERTIES OF RADIOACTIVE RAYS RADIOACTIVITY-RADIOACTIVE RAYS-ALPHA RAYS-BETA RAYS-GAMMA RAYS-PROPERTIES OF RADIOACTIVE RAYS The phenomenon of emission of these powerful rays is called "Natural Radioactivity" and the element that emits such rays is called "Radio Active Elements". rays produce burn and source on human body. www.citycollegiate.com /atomic_structureXIf.htm   (151 words)

lec16.doc Alpha rays (which were the bullets used by Ernest Rutherford in his famous scattering experiment) are simply helium nuclei--each alpha ray (or particle) has two protons and two neutrons bound together. Both gamma rays and beta rays can harm the stable nuclei within our bodies, but one of their more harmful abilities is to disrupt molecular bonds. Gamma rays are high-energy rays of light (remember that high energy means high frequency and high frequency means small wavelength). csma31.csm.jmu.edu /physics/mattson/lec16.doc   (398 words)

LidRock - "How Nuclear Radiation Works" Gamma rays are like X-rays in that they penetrate matter, but they are more energetic than X-rays. The majority of cosmic rays (perhaps 85 percent) are protons traveling near the speed of light, while perhaps 12 percent are alpha particles traveling very quickly. Gamma rays are made of energy, not moving particles like alpha and beta particles. www.lidrock.com /nuclear2.htm   (682 words)

ClickATutor Tutorials Gamma rays were later proven to be a form of electromagnetic radiation, much like light or X rays, but with much shorter wavelengths. Rutherford went on to prove that alpha rays are nuclei of helium atoms by collecting the rays in a vacuum tube and showing the buildup of helium gas over several days. In 1903 Rutherford found that alpha rays were deflected slightly in the opposite direction from beta rays, showing that they are massive, positively charged particles. www.clickatutor.com /BasePUB.asp?pid=4729   (255 words)

Radiation Health Effects X rays are similar to gamma rays, but they consist of an array of different wavelengths, whereas gamma rays have a fixed value specific to the radioactive material. Radiation consists of particle rays such as alpha and beta rays, electromagnetic rays such as gamma and x-rays, and neutron particles. Alpha rays pass less than one millimeter in water, and because a single piece of paper can stop an alpha ray, health effects only appear when alpha-emitting particles are ingested. www-rcf.usc.edu /~meshkati/tefall99/part1.html   (963 words)

What are alpha rays? How are they... An alpha particle is made up of two protons and two neutrons, all held together by the same strong nuclear force that binds the nucleus of any atom. The alpha particle is the radiation given off during the process of "alpha decay". In fact, an alpha particle really is a nucleus - it's the same as the nucleus of a common atom of helium- but it doesn't have any electrons around it, and it's traveling very fast. education.jlab.org /qa/radbegin_04.html   (720 words)

Crepuscular Rays iven that crepuscular rays arise from virtually parallel rays of sunlight that are partially blocked by an object, it may seem counterintuitive that they appear to diverge from the solar point. Also note from the image that the rays become less apparent the farther they are from the solar point. key component for crepuscular rays is a shadow. www.ems.psu.edu /~demark/471/CrepuscularRays.html   (951 words)

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