Dispersion and the speed of light “So far as problems involving light are concerned‚ the electrons (in atoms) behave as though they were held by springs”.Feynman “In a microscopic but otherwise classical analysis‚ the electric field in electromagnetic radiation accelerates electrons held by springs in the atoms of a piece of glass‚ and these accelerated electrons re-radiate in all directions. The observed light is the superposition of the electric (and magnetic) fields of the incoming
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CHEM 208 Module 2: List the steps of the scientific method: Scientific Method: performing a study in organized step: (led to enunciation of Law of Conversation of Mass and Matter) 1. Performing experiments: a. An experiment is a set of steps (procedures) that are performed under controlled
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Cathode ray tube is used for producing images‚ when an electron beam hits the surface made out of a phosphorescent‚ and the cathode ray tube is basically a vacuum tube. An example of a cathode ray tube is a computer desktop and the picture tubes in television are similar to the cathode ray tube in television. There are numerous components of cathode ray tube‚ which are the Electron gun‚ Anodes‚ Coil‚ Phosphor-coated screen‚ electronic beam and the spot through which the beam passes through. In a
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means unequal electron sharing. One molecule has a greater pull or stronger electronegativity on shared electron compared to the other molecule. The side with the stronger electronegativity will be negative while the molecule with the weaker electronegativity is positive. Differences in polarity are caused by the differences in electronegativity levels (the tendency of an atom to attract electrons when forming a bond) and the alignment of the atoms which can make an uneven electron distribution.
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The scientific definition of an atom has changed a lot throughout history. Currently‚ the atom is known as the basic unit of a chemical‚ but there was a time when that was not known among scientists. There were multiple scientists that contributed to the creation of the first Atomic Theory: Democritus‚ Antoine Lavoisier‚ Joseph Proust‚ and John Dalton. Dalton took the information that he had taken from the three scientists prior to him and put everything into one theory. The Atomic Theory is the
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Question 1 The subatomic particles that play the greatest role in cellular chemical reactions are Your Answer for Question 1 isotopes. Comments The correct answer is: electrons. Max Score: 5 Actual Score: 0 Question 2 The structural unit that retains the properties of an element is the Your Answer for Question 2 atom. Comments Correct!!
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reactions are electrons. protons. neutrons. isotopes. Question 2 of 20 The structural unit that retains the properties of an element is the molecule. atom. cell. electron. Question 3 of 20 Which of the following are found in the nucleus of an atom? Protons Neutrons Electrons A and B Question 4 of 20 The component of an atom or molecule that is most important in determining its chemical properties is the isotope. neutron. electron. proton
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Edexel IGCSE Chemistry Revision Notes IGCSE Chemistry Triple Award Revision Guide Topic Introduction to chemistry Atomic Structure Structure and Bonding – Ionic Bonding Structure and Bonding – Covalent and Metallic Bonding Organic Chemistry - Alkanes Organic Chemistry – Alkenes / Addition Polymerisation Organic Chemistry – Alcohols / Condensation Polymerisation Calculations Periodic Table Reactivity Series and Metal Extraction Electrolysis Energetics Acids‚ Bases‚ Salts and Neutralisation
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objects around you. Atoms are composed of particles called protons‚ electrons and neutrons. Protons carry a positive electrical charge‚ electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom‚ called the nucleus‚ and the electrons ’orbit’ the nucleus. A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. Protons and
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Green Computing: Should It Be Photonics or Spintronics for Quantum Computers? Xavier Mattam xaviermattam@hotmail.com Abstract - Quantum Computers are widely acclaimed as the future computers. There is so much research being done in this field of Quantum Computers that one would rightly feel that the advent of Quantum Computers for everyday use is not far off. But at a time when Global Warming has become a real threat to our very existence‚ the question we need to responsibly ask ourselves before
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