Centre Number Surname Other Names Candidate Signature Candidate Number For Examiner’s Use Examiner’s Initials Question Mark General Certificate of Secondary Education Higher Tier June 2011 1 2 3 4 5 6 TOTAL Science B Unit Physics P1 PHY1H Physics Unit Physics P1 Friday 17 June 2011 1.30 pm to 2.15 pm H For this paper you must have: a ruler. You may use a calculator. Time allowed 45 minutes Instructions Use black ink or black ball-point pen. Fill in
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CHEMISTRY FOR HUMAN WELFARE: IT’S PROMISES AND CONCERNS 2011 had been officially declared “The International Year of Chemistry” t o commemorate the achievements of chemistry and its contributions to mankind. It is so fitting that 2011 is the centenary year for the award of Nobel Prize to Marie Curie for her discovery of Radium and Polonium. Also this is the 150th birth anniversary of Dr. P .C Roy. All living things in this beautiful world are nothing but
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various reactors serviced different companies and suppliers including General Electric‚ Toshiba‚ and Hitachi. On March 11th‚ 2011‚ an earthquake and subsequent tsunami caused a series of equipment failures‚ nuclear meltdowns and releases of radioactive materials. According to the International Business Times (Australia) "Fukushima is not the worst nuclear accident ever but it is the most complicated and the most dramatic disaster.” (IBT‚ 01) On April 2011 The Nuclear Institute rated the disaster
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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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bus 9.2 – Production of Materials: Δ. Construct word and balanced formulae equations of all chemical reactions as they are encountered in this module: • Basic reactions to remember: – Acid reactions: ▪ acid + base [pic] salt + water HCl(aq) + NaOH(aq) [pic]NaCl(s) + H2O(l) ▪ acid + metal [pic] salt + hydrogen gas HCl(aq) + Mg(s)[pic]MgCl2(s) + H2 (g) ▪ acid + carbonate [pic] salt + carbon dioxide gas + water HCl(aq) + CaCO3(s)[pic] CaCl(s) + CO2(g) + H2O
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preventing the release of radioactive materials through contaminated water and air.7 The Japanese nuclear safety commission estimated that the plant’s reactors "released up to 10‚000 terabecquerels of radioactive iodine-131 per hour into the air for several hours after they were damaged."4 Unlike Chernobyl‚ no immediate deaths or radiation sicknesses have been reported from the accident‚ but the government is still hesitant to allow evacuees to return to the contaminated
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useful work. Satellites=free fall. Ionizing radiation=energy in the form of waves or paricle Beta radiation-just an electron‚ wont go through skin but really bad inside you alpha- he2+ nucleus-wont go through skin but bad once inside. Comes from radioactive particles like lead 210 or iodine. gamma- high energy photon‚ may go through you. neutrineos-noninteracting‚ come from fusion‚ cosmic rays-very powerful. Come from supernovas. Moves at speed of light moderator-slows neutrons b/c they are absorbed
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1. How much of our global energy supply do nuclear power‚ biomass energy‚ and hydroelectric power contribute? How much of our global electricity do these three conventional energy alternatives generate? Biomass provides 10.8% of global primary energy use‚ nuclear power provides 6.5%‚ and hydropower provides 2.2% of global primary energy use. Nuclear power generates 15.8% of the world’s electricity‚ and hydropower generates 15.9%. 2. Describe how nuclear fission works. How do nuclear plant engineers
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metals red Transition elements green Chalcogens brown Lanthanides orange Actinides light blue 12. Outline the symbol’s box in dark green if it is RADIOACTIVE in its most common form. Notes The nucleus The nucleus is at the center of the atom and contains the protons and neutrons. Protons and neutrons are collectively known as nucleons. Virtually all the mass of the atom is concentrated
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fusion. Nuclear fission is a process where the nucleus of an atom splits and releases radioactive materials such as uranium which are used in many ways. Nuclear fusion is a process s when the two atoms of an element get together and large amount of heat is generated. in this way the nucleus releases tremendous energy that is utilized for many purposes both constructive and destructive. Nuclear energy- a boon This powerful energy was found by William Rontgen in 1895. The energy released by the
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