IB Questionbank Physics Energy‚ Power and Climate 1. In which of the following places will the albedo be greatest? A. B. C. D. A forest A grassland An ocean A polar ice cap (Total 1 mark) 2. A spherical black body has absolute temperature T1. The surroundings are kept at a lower absolute temperature T2. What is the net power per unit area lost by the body? A. B. C. D. σT14 σT24 σ(T14 – T24) σ(T14 + T24) (Total 1 mark) IB Questionbank Physics 1 3. What is the unit of surface heat capacity
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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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fissile material‚ a material capable of sustaining a chain reaction of nuclear fission‚ is assembled into a supercritical mass which is the amount needed to start a chemical reaction. However‚ fusion weapons have to rely on fusion reactions between isotopes of hydrogen. Both of these reactions release enormous quantities of energy from relatively small amounts of matter. This amount of energy released is equivalent to the amount of about 20‚000 tons of TNT. However‚ the thermonuclear bomb‚ a nuclear
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The process can be seen in figure 15. Figure 15‚ nuclear fusion In addition‚ nuclear energy is a form of energy that can be harnessed from an atomic nucleus‚ and can be released by radioactive decay‚ fusion‚ or fission. This source of energy makes use of the power of nuclear reactions to release energy for the use of electricity‚ heating‚ and also propulsion. Nuclear energy is released when materials like uranium‚ is concentrated so
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scientific equipment and the observers‚ and the Enola Gay to carry the bomb. Enola Gay was named after the pilot‚ Colonel Paul Tibbets‚ after his mother. The atomic bomb was named “little boy”. "Little Boy" was created using uranium-235‚ a radioactive isotope of uranium.
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Selenium‚ found in group 16 of the periodic table‚ follows a cycle in the environment as it transfers between the biosphere‚ atmosphere and hydrosphere. It is also an essential element for humans and animals. It can cause both deficiencies and toxic effects if not taken in the correct quantities. This essay outlines the general features and behaviour of Se in the primary environment‚ its general abundance and its ability to substitute into minerals. Its Eh and pH also are important factors in determining
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Non-metals have a high electron affinity · Atom: The basic unity of an element which still retains the elements properties · Atomic number: the unique number of protons in the nucleus of a particular element · Isotope: Atoms of the same element which contain a different number of neutrons · Periodic law: The chemical and physical properties of the elements repeat in a regular‚ periodic pattern when they are arranged according to their atomic number.
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The Benefits of Nuclear Technology Concerns about the disastrous event in the past make people to look into nuclear technology in a very negative perspective. For example‚ the 1979 partial meltdown of a reactor at Three Mile Island and the Chernobyl disaster in 1986. On that note‚ the most recent international event regarding nuclear technology possession‚ where Iran falls under probation for using nuclear technology for non-peaceful purposes (Iran entitled to use peaceful nuclear technology: EU
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Moles 1.How is molar mass calculated and why is it useful? You have to multiply the atomic weight of each element by the number of atoms that it contains in a compound. Molar mass is useful because its used to change a measurement of mass to an amount of a substance such as the number of particles. 2.Define a mole in chemistry and give 3 examples equivalent units that are used in chemical calculations. A mole measures the amount of a substance. Three examples that are equivalent to a mole is molar
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charged particle‚ and thus he is credited with the discovery and identification of the electron; and‚ in a broader sense‚ with the discovery of the first subatomic particle. Thomson is also credited with finding the first evidence for isotopes of a stable (non-radioactive) element in 1913‚ as part of his exploration into the composition of canal rays (positive ions). He invented the mass spectrometer. J.J. Thomson discovered the electron. He found that the electron was a very small‚ negatively charged
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