light is best described by a wave model‚ but understanding emission and absorption requires a particle approach. The fundamental sources of all electromagnetic radiation are electric charges in accelerated motion. All bodies emit electromagnetic radiation as a result of thermal motion of their molecules; this radiation‚ called thermal radiation‚ is a mixture of different wavelengths. At sufficiently high temperatures‚ all matter emits enough visible light to be self-luminous; a very hot body appears
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down scans are taken. These scans are taken by all angles and depending on the picture the size of the camera is also chosen. The camera can also move around the body of the patient. The machine doesn’t produce any sound or transmit any harmful radiations. What kind of diseases can be diagnosed by nuclear medicine? Nuclear medicine can diagnose a wide range of diseases. It can be used to diagnose abnormal lesions deep in the body without exploratory surgery. The procedure can also determine whether
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but one specific scientific advance that I will be discussing is the discovery of physics through X-rays and radiation‚ which was discovered by Wilhelm Röntgen. After he published a paper on his discovery of X-rays in 1895‚ there was great study and research done by physicists such as: Antonie Henri Becquerel‚ Marie Curie‚ and Ernest Rutherford on radioactivity and the formation of radiation through x-rays. Although Wilhelm was credited for the naming of x-rays and creating the first working x-ray
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Write your name here Surname Other names Centre Number Candidate Number Edexcel GCSE Physics/Science Unit P1: Universal Physics Higher Tier Friday 2 March 2012 – Morning Time: 1 hour You must have: Calculator‚ ruler Paper Reference 5PH1H/01 Total Marks Instructions black ink or • Usein the boxesball-point pen. page with your name‚ at the top of this • Fill number and candidate number. centre all • Answer thequestions. in the spaces provided questions
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least‚ not as we know them‚ says renowned physicist Stephen Hawking‚ potentially provoking a rethink of one of space’s most mysterious objects. A new study from Hawking also says that black holes may not possess "firewalls‚" destructive belts of radiation that some researchers have proposed would incinerate anything that passes through them but others scientists deem an impossibility. (Editor’s note: Watch for our feature "The Truth About Black Holes" in the March issue of National Geographic magazine
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waves are involved. Waves do not have mass or charge. Photons All electromagnetic radiation consists of photons. A photon is a packet of energy‚ or a quantum of electromagnetic energy. Gamma-photons are the most energetic out of all the types of photons. The energy of a photon is directly proportional to the frequency of the electromagnetic radiation of which it is a part of‚ so high frequency radiation means high energy
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of the energy sent out by the generating plant must arrive at the receiver to make the system economical. Some common forms of wireless electricity transmission methods are Direct Induction followed by resonant magnetic induction‚ electromagnetic radiation in the form of microwaves or lasers. With this technology we can reduce power losses produced through wired lines. Different concepts and application of wireless power transmission are discussed in this paper. Introduction The definition of Wireless
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Nuclear Chemistry Imagine the majority of Earth being quarantined off and people having to live in specified areas to avoid harmful radiation that originated from nuclear energy/waste. The integration of nuclear energy/medicine is largely controversial among people. Every side to the argument has its benefits as well as its negative consequences. Nuclear energy should not be used in society because of the threat it poses to thousands of people. In contrast‚ nuclear medicine has positive aspects that
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Organic chemistry is the study of essentially all substances containing carbon. Organic compounds that contain only carbon and hydrogen are called hydrocarbons. The simplest hydrocarbons are the alkanes which contain only single covalent bonds. Methane is the simplest alkane. It is also the major component of natural gas. Methane contains only 1 carbon in the molecular formula and the structural formula. There is ethane which is 2 carbons‚ propane that is 3‚ butane which is 4‚ pentane which is 5
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Space Radiation Too Deadly For Mars Mission by Charles Q. Choi‚ Special to SPACE.com Date: 31 March 2008 Time: 10:00 AM ET Dangerous levels of radiation in space could bar astronauts from a mission to Mars and limit prolonged activity on the moon‚ experts now caution.However‚ more research could reveal ways to handle the risks that radiation poses to space missions.The magnetic field of Earth protects humanity from radiation in space that can damage or kill cells. Once beyond this shield‚ people
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