Tsunamis become disasters because of the human context in which they occur. Do you agree or disagree with this statement? Use examples of known tsunami events recently and in the past to illustrate your arguments. According to Wisner et al 2004‚ "disasters occur when hazards meet vulnerability‚” implying that in unpopulated areas hazards can not become disasters as there is no vulnerability (Quarantelli E.L. 1998). Without humans being involved‚ tsunamis are nothing but giant waves; they may modify
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of medicine‚ Cobalt-60 is used in cancer radiotherapy. b) Describe how the radioisotope is made. Radioactive cobalt-60 is produced in a process called activation‚ when materials in reactors‚ such as steel‚ are exposed to neutron radiation. Often isolated neutrons collide into atoms‚ and because they have no charge there is no repulsive force against them. These neutrons turn the atoms into isotopes; in this case typical iron-56 becomes iron-57‚ 58 and then 59. The heavy iron-59 atom is very unstable
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Definition of an isotope: An isotope is an Atom with the same number of protons‚ but differing numbers of neutrons. Isotopes are different forms of a single element. Smoke Detectors I) Americium-241 emits alpha particles. II)The alpha particles emitted by the Am-241 collide with the oxygen and nitrogen in air in the detector’s ionisation chamber to produce charged particles (ions). When smoke enters the chamber‚ the smoke particles attach to the charged ions‚ neutralizing them
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DIFFERENT TYPES OF ENVIRONMENTAL POLLUTIONS When there are some physical‚ chemical or biological changes occur in our physical environment it is known as pollution and the substances which brings these changes are known as pollutants. The sources for the pollution can be natural or manmade. Following are the types of Environmental pollution. 1. Air pollution 2. Water pollution 3. Soil pollution 4. Noise pollution 5. Marine pollution 6. Thermal pollution
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Lesson 08.01: Half-life and Radioactive Decay · Distinguish between nuclear and chemical reactions. · Compare and contrast different types of nuclear decay and the properties of the three types of radiation (alpha‚ beta‚ and gamma) discussed in the lesson. · Be able to predict the isotope or radiation produced by a nuclear decay reaction when the other product is given. · Describe and make predictions regarding half-life‚ including using a graph or set of data to determine the half-life of
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Nuclear Chemistry webquest by Margaret Moore semester 1 Chemistry Part One 1) The term Half-life for a radio-active substance means the time it takes for the substance to decay while decreasing by ½. 2) Spontaneous fission is a type of radioactive decay in heavy elements with unstable nuclei being split into more stable smaller fragments 3) Two important application of neutron radiation are neutron therapy for tumors/cancer and neutron bombs for defense. 4) Ionization radiation is radiation
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chemical elements‚ oldest star clusters‚ as well as white dwarf stars. Scientists also try to find the universes rate of expansion‚ and behavior of globular clusters‚ which are spherical collection of stars. In order to find this‚ scientists can use radioactive decay to determine how old a given mixture of atoms is in rock samples. In order to find the rate of expansion of the universe‚ The Hubble constant was the basic cosmological model dependent on density and composition of the universe. Some formulas
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Hot b. Being at a high temperature. 3. Causing a burning sensation‚ as in the mouth; spicy: hot peppers; a hot curry. a. Marked by intensity of emotion; ardent or fiery: a hot temper. b. Having or displaying great enthusiasm; eager: hot for travel. a. Informal Arousing intense interest‚ excitement‚ or controversy: a hot new book; a hot topic. c. Violent; raging: a hot battle. 7. Slang Sexually excited or exciting. a. Most recent; new or fresh: a hot news item; the hot fashions for fall.
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needed to balance the following nuclear reaction? 235 92 U + b) 138 53 1 0 n ? + c) 137 53 96 39 1 Y + 30n a) 139 53 I I I d) 136 53 I e) 135 53 I 3. Only one of the following isotopes of strontium undergoes radioactive decay by – emission. Which one is it? a) 83 38 Sr b) 86 38 Sr c) 87 38 Sr d) 88 38 Sr e) 90 38 Sr 4. For which one of the following atoms or ions would the 2s and 2p orbitals have the same
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represented by first-order differential equations. In chapter 2 we have discussed few methods to solve first order differential equations. We solve in this chapter first-order differential equations modeling phenomena of cooling‚ population growth‚ radioactive decay‚ mixture of salt solutions‚ series circuits‚ survivability with AIDS‚ draining a tank‚ economics and finance‚ drug distribution‚ pursuit problem and harvesting of renewable natural resources. 4.1 Cooling/Warming law We have seen in Section
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