sample is first prepared. (a) 2.02x1015‚ (b) 1.01x1015‚ 3.78x1011Bq‚ (c) 2.52x1014‚ 9.45x1010Bq Q2. 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
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Potassium makes up 1.5% - 2.1% of the Earth’s crust weight. In the crystal structure of potassium‚ the closest K-K separation is 461 nm and the metallic radius spans 231 nm. Potassium has three major isotopes. One out of the three is radioactive and is called K-40. K-39 and K-41 are the other two isotopes of potassium‚ which are stable. Prior to the 18th century‚ people used potassium without realizing it. The main two uses were for soap and potash‚ which is a potassium compound formed by burning
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population‚ measure at time zero. Finding the constant growth or decay of any group of data would be much harder without use of logs. Carbon dating is a technique used by scientists to date fossils. It relies on the fact that the C14 isotope of carbon decays into another isotope of carbon‚ C12 at a rate proportional to its mass. This means that it has a constant rate of decay. The same equation is used for this as for continuous compounding and population growth. Though logarithms are not a part of most
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atomic number defines the element which is the number in the nucleus. 3) What is an isotope? Give an example (show how it is an isotope). Isotopes are atoms of the same element that have different mass numbers due to different numbers of neutrons. An example of an isotope is Uranium. On the periodic table the atomic number is 238 which is the elemental form. The example of an isotope is Uranium 235. 4) Compare and contrast the 3 basic types of chemical bonds and give
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similar to but not as extreme as the Permian-Triassic and the Cretaceous-Tertiary extinctions. The research conducted by P.D. Ward and his team of scientists is supported mainly by carbon isotope evidence collected from the Queen Charlotte Islands‚ British Colombia‚ Canada. The evidence of the carbon isotopes that were unaffected by diagenesis is synchronized with the sudden extinction of marine plankton which leads one to infer that the two extinctions happened around the same time. The scientists
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molecule is a combination of two or more | |atoms bonded together. | Table of Content Constituents of Atoms 3 Isotopes of an Element 4 But the Orbits Are Quantized 6 Atomic Excitation and De-excitation 7 Ionization of Atoms 8 Chemical reactions and molecules 9 Molecular science 10 Molecular size 11 Molecular geometry 11 Molecular spectroscopy
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So it is possible for the mars sized object to knock off a chunk of earth. Scientists have also taken isotopes from the moons titanium and earths and it was a complete match‚ but first the Apollo missions samples of titanium looked different.The scientists had to alter the data to find out the samples were the same due to cosmic rays. Cosmic rays are from
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During the 20th century‚ the element radium was used for commercial purposes and medicinal. While radium had some positive effects in both these areas‚ many people failed to see that radium actually had deadly capabilities. One example of the deadliness? Of radium in human life was with an energy drink called Radithor. The drink had radium dissolved in the solution. The owners of the company preached the benefits of the drink and that it could possibly increase sexual desire. In this way‚ many people
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when one of the following rocks is metamorphosed? Limestone In which of the following sedimentary rocks would it be easiest to determine the type of rocks from which the sediment was derived? Conglomerates Which of the following radioactive isotopes is the most useful for dating very young wood and charcoal? Radiocarbon The prograde part of a metamorphic P-T path occurs during _________________. Burial and heating Someone brings a piece of wood from Noah’s Arc and asks you to date the
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Rosemary Hurrey EAS-101-OL009 10 July 2013 Written Assignment 1 Answer the following questions. 1.Summarize advances over time in determining the age of the Earth‚ including the importance of the discovery or radioactivity. Throughout the past few decades‚ there have been advancements in new techniques to help determine the age of the Earth. Currently scientific evidence believes that the Earth is between 4.5 and 4.6 billions years old. To help determine the age of the earth‚ radiometric dating
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