April 2012 Exponents and Logarithms An exponent is the number representing the power a given number is raised to. Exponential functions are used to either express growth or decay. When a function is raised to a positive exponent‚ it will cause growth. However‚ when a function is raised to a negative exponent‚ it will cause decay. Logarithms work differently than exponents. Logarithms represent what power a base should be raised to in order to produce a specific given number. Logarithmic and exponential
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of Stability will allow you to predict how unstable nuclides will decay. The typical modes of radioactive decay are alpha decay‚ beta decay and electron capture (or positron emission). During alpha decay‚ the mass number of the nuclide decreases by 4 units and the number of protons decreases by 2. This type of decay is associated with heavy‚ unstable nuclides. Since no stable isotopes exist above atomic number 83‚ alpha decay stabilizes those isotopes having a Z value greater than 83 by lowering
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&ATOMIC NUMBER AND MASS NUMBERS After reading this section you will be able to do the following: * Define and determine the atomic number of an atom. * Define and determine the mass number of an atom. What is an atom’s atomic number? The number of protons in the nucleus of an atom determines an element’s atomic number. In other words‚ each element has a unique number that identifies how many protons are in one atom of that element. For example‚ all hydrogen atoms‚ and only hydrogen atoms
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Radiometric dating is the process of estimating the age of rocks from the decay of radioactive elements inside the rock specimen. This process utilizes radioactive isotopes to date igneous rocks. These radioactive isotopes have a distinctive number of atoms that present themselves unstable. These atoms will inevitably decay through a series of evolutions. We will take Uranium as example. Uranium will ultimately decay into the stable element lead. The father element being the Uranium and the end
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Issues Briefing Paper 26. (2004). Radioisotopes in medicine [online] 9. Czarnecki‚ L. (2002). Nuclear physics [online]. Available from: http://www.hpwt.de/Kern2e.htm [Accessed: 14/12/2005] 10. TIS Technical Publications. (2003). Theory: Radioactive decay [online]
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5 Al – Hasseb Sekolah Menengah Sains Banting Contents No | Contents | Page | 1. | Appreciation | | 2. | Introduction | | 3. | Analysis : - Nucleus Of An Atom - Radioactive Decay - The Uses Of Radioisotopes - Nuclear Energy - The Importance Of Proper Management Radioactive Substances | | 4. | Conclusion | | 5. | References | | Appreciation Assalamualikum
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Running Head: URBAN OUTIFTTERS Urban Outfitters Continuing Case Study Introduction to Business- BUS 100 24 October 2010 1. Identify at least three challenges when setting up a business. Explain why they are challenges. First off you should consider "Is there really a need for your new business?"(McNamara‚ 2002). Market research should first be conducted even at the lowest level. If I drive around my neighborhood and there are already several Mexican food establishments‚ do I really need
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for half of its atoms to decay into something else. M&Ms were chosen because they all have the same m mark on the on one side. In this lab you will go through predicting and counting the number of remaining "mark-side up" candies that should help understand that rates of decay of unstable nuclei and how it can be measured; that the exact time that a certain nucleus will decay cannot be predicted; and that it takes a very large number of nuclei to find the rate of decay. Purpose To stimulate
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The unstable isotope 40K is used for dating of rock samples. Its half life is 1.28x109 years. (a) How many decays occur per second in a sample containing 1.63x10-6g of 40K? (b) What is the activity of the sample in curies? 0.421Bq ‚ 1.14x10-11Ci (a) Q3. The most common (99.3%) isotope of Uranium‚ 238U‚ has a half life of 4.47x109 years‚ decaying to 234Th by α emission. (a) What is the decay constant? (b) What mass of uranium would be required for an activity of 12.0μCi? (c) How many α particles
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When most people hear the term fossil dating‚ two things come to mind‚ one being‚ “Is that what you’re grandparents do?” (Valls‚ biology class) and two‚ “what is that?”. By using either relative or radioactive dating methods‚ most geologists have the ability to tell how old a single fossil is. As always though‚ we are left with the question of which is better? Delve deeper to understand the comparisons and contrasts of Relative and Radiometric dating‚ as well as further information on both topics
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