Episode 515: The radioactive decay formula Here‚ the key idea is the random nature of the decay. Avoid simply pulling pull equations out of the air – at least make them plausible. Summary Discussion: The meaning of the decay constant λ. (15 minutes) Discussion: The link with half-life. (15 minutes) Student experiments: Analogue experiments linking probability with decay rates. (20 minutes) Discussion: The meaning of the decay constant λ. Start from the definition
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All kinds of rocks contain very small amounts of radioactive elements‚ these are unstable and they break down into more stable atoms over time‚ which is called radioactive decay. Scientists can tell how old a rock is by using radiometric clocks‚ or by looking at its absolute age. Geologists measure the amount of certain radioactive elements; as time passes the radioactive elements change at regular rates‚ into non-radioactive elements. The older a rock is the larger the number of elements. The age
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8.01- Half-life and radioactive decay Shelby Wolf Uranium 1) Where is this substance most likely found and how abundant is it? It is found within the Earth’s crust‚ also found in rock‚ soil‚ rivers‚ and oceans. It is believed to be available for at least the next 85 years‚ U-238: 99.27 U-235: .72 U-234: 0.0055 2) What type of decay does this substance undergo and how harmful can it be to those exposed? The U-235 undergoes nuclear fission
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Radioactive Decay‚ Nuclear Fission and Nuclear Fusion When elements undergo radioactive decay the atoms of one element are changed into the atoms of another element when an alpha or beta particle is emitted from an unstable nucleus. When a nucleus disintegrates and emits an alpha particle it is alpha decay‚ the alpha particle emitted contains two protons and two neutrons which is equivalent to a helium nucleus being released. Alpha decay occurs because there are too many protons‚ which causes
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Radioactive Isotopes An isotope is one of two or more atoms with the same number of protons‚ and position in the periodic table‚ but different number of neutrons and physical properties. Isotopes have an unstable nucleus that decay suddenly by a release of nuclear electrons and radiation. This essay will be discussing one of the applications and uses of the radioactive isotopes‚ and it will also state one problem that radioactive isotopes can address. The radiation characteristically
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ELECTRONIC DICE . TO CONSTRUCT AN ELECTRONIC DICE USING LEDS . BACKGROUND: LED’s History The first known report of a light-emitting solid-state diode was made in 1907 by the British experimenter H. J. Round. However‚ no practical use was made of the discovery for several decades. Independently‚ Oleg Vladimirovich Losev published "Luminous carborundum [[silicon carbide]] detector and
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INTRODUCTION Radioactive emissions are electromagnetic radiations which occur due to the spontaneous disintegration of unstable nuclei. Natural elements with atomic number greater than 83 and isotopes of some lighter elements are found to be radioactive. They are categorized as alpha‚ beta and gamma radiations. Alpha particles are positively charged helium-4 nuclei ‚ beta particles are high energy-high speed electrons while gamma rays unlike alpha and beta radiation have no mass and charge and
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Radioactive Isotopes Radioactive isotopes are any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha‚ beta‚ and gamma rays. Every chemical element has one or more radioactive isotopes. More than 1‚000 radioactive isotopes of the various elements are known.. Approximately 50 of the isotopes are found in nature; the rest are produced artificially as the direct products
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Loss of Thalamic Nuclei for “Head Direction” Impairs Performance on Spatial Memory Tasks in Rats Keerthi Thallapureddy Dr. Mercedes Fernandez NOVA Southeastern University The purpose of this study is to investigate the effects of the removal of two nuclei‚ the anterior dorsal (AD) and the lateral dorsal (LD)‚ in rats on the performance of spatial and nonspatial tasks. The reason for this investigation is to advance in the knowledge and understanding of the biological bases of navigation. The
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isotopes of radioactive elements. Isotopes * atoms of the same element that have the same number of protons but different numbers of neutrons. * Most isotopes are stable‚ meaning that they stay in their original form. * Other isotopes are unstable. * Scientists call unstable isotopes radioactive. Radioactive decay * Radioactive isotopes tend to break down into stable isotopes of the same or other elements. * Refers to the process in which a radioactive form of
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