convection and radiation. Conduction is when heat travels through solids. Hot atoms vibrate and their energy is passed on to neighbouring atoms which vibrate and become hot. Convection is the process by which heat is transferred by warm liquids or gases. Warm air is less dense than cold air because particles have more energy so they spread further. So the hot air rises and transfers heat and the cold air replaces it Radiation: all objects give out and take in thermal radiation which is also called
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Ideas about the solar system Our understanding of the solar system has changed over many centuries. Scientists such as Ptolemy‚ Copernicus and Galileo added their ideas to our changing understanding. We observe the universe using a variety of equipment‚ from telescopes to orbiters and landers. Models of the solar system The planets and the Sun orbit the Earth in Ptolemy’s model. Our understanding of the universe has changed over time. Different civilisations have created different models to
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Tips on Radiation Exposure CINCINNATI‚ Oct. 2‚ 2012 /PRNewswire-USNewswire/ -- With millions of X-rays performed on children every year‚ kids are more likely to receive X-rays than any other type of imaging exam. A new education campaign seeks to equip parents with the knowledge they need to make informed decisions about their kids and X-rays. Through a series of online teaching materials aimed at parents and medical professionals‚ Image Gently’s "Back to Basics" campaign promotes radiation protection
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INTRODUCTION: The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. Radiation can be said to be energy that travels and spread as it goes. The "electromagnetic spectrum" of an object has a different meaning‚ and is instead the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object. We tend to witness different radiations of the electromagnetic spectrum without knowing‚ example is the visible light that we see with
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Global Radiation Therapy Market Report: 2012 Edition For more details on the content of report and ordering information please visit: http://www.aarkstore.com/reports/Global-Radiation-Therapy-Market-Report-2012-Edition-158075.html As the technological environment is swiftly undergoing evolution‚ companies operating in the healthcare/science/pharmaceutical/therapeutic industry are now scaling new heights. Also‚ the respective sector’s growth is boosted by the rising number of health related
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Introduction (5:03) 1. What is the name for all the electromagnetic waves that exist? Names of the electromagnetic waves that exist are Gamma Rays‚ X-Rays‚ Ultraviolet Waves‚ Visible Light‚ Microwaves‚ and Radio Waves. 2. What are electromagnetic waves produced from? What two things do they have? Electromagnetic waves are produced by the vibration of charged particles and have electrical and magnetic properties. 3. What is the name for the section of the electromagnetic spectrum that
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Transuranic Elements and their Production Transuranic elements are elements that have an atomic number greater than 92. Transuranic elements have been synthesised in nuclear reactors or in high-energy particle accelerators. Neptunium and plutonium were the first transuranic elements to be synthesised in 1940 by Glenn Seaborg’s research team in the USA. Uranium 238 is bombarded with neutrons produced by the nuclear fission of U-235. Initially an isotope of uranium (U-239) forms which decays
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about different variations of treatments‚ those in which have helped millions combat diseases. It uses radiation to administer information about the functioning of a person’s organs or to treat diseases. It detects early signs in the tissue. Nuclear medicine procedures are very safe and do not require anesthesia. A small dose of radiopharmaceuticals is introduced into the body with low radiation and still provide a definite medical evaluation. That is why it has been around for so long. It is important
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radiant energy and a way to confine the energy. (1) The source for gamma radiation can either be the radioactive form of the element cobalt‚ which would be Cobalt 60‚ and the element cesium‚ and that would be Cesium 137. These substances do not give off neutron which means that they don’t make anything around them radioactive. When not in use‚ this source is kept in a pool of water which completely absorbs the radiation. To irradiate the food‚ the source is pulled from the pool and into a chamber
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might think that if the black hole absorbs all kinds of radiation‚ it might possible not emit any too. But Stephen Hawking did a good piece of thinking on that concept and came up with the idea of the popular Hawking Radiation. He came up with this idea when his fellow student Jacob Bekenstein suggested that a Black hole should have a finite non-zero temperature and entropy and Black holes must emit some kind of radiation‚ Hawking radiation states that ’Close to the event horizon of a black hole
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