BAND THEORY OF SOLIDS According to quantum free electron theory of metals‚ a electron in a metal experiences constant(or zero) potential and free to move inside the crystal but will not come out of the metal because an infinite potential exists at the surface. Bloch Theorem: According to this theorem‚ the periodic potentials due to the positive ions in metal have been considered. (i.e. the electrons moves in a periodic potential provided by lattice). If the electron moves through these ions‚
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of a nation to improve the lives of its citizens. There are various forms of energy but here our discussion will be on solely on electricity and how it contributes to national development. Electricity is an energy made available by the flow of electric charge through a conductor. We use electricity every day‚ thus without it we would not be able to watch television‚ listen to radio‚ heat our food and among others. The main purpose of this essay is to discuss the respective ways in which energy (electricity)
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EECE 352: 352 PN Junctions Peyman Servati y Outline • • • • Diffusion and drift currents Current continuity PN Junctions Diodes‚ photodetectors‚ solar cells Diffusion of Electrons Movement of electrons and holes (charge carriers) results in ( g ) conduction in materials. Electrons and holes in solids move based on Brownian motion (random walk). In this random movement‚ electrons effectively move from a movement location where the concentration is higher to where the concentration is
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primary cell‚ that supplies current. What is Current? A flow of current which results from the ordered directional movement of electrically charged particles. A current is the rate of flow of charge. What is Electrolyte? The electrolyte in a cell is a chemical medium that allows the flow of electrical charge between the cathode and anode.” . The electrolyte is usually a solution of water or other solvents in which the ions are dissolved.
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Electrolysis a) Electrolysis is the decomposition of a substance to give simpler substances. The substance being electrolysed has to be an ionic compound. b) The substance being decomposed is called the electrolyte. c) In electrolysis the electric current enters and leaves the electrolyte by conducting rods called electrodes. The positive electrode is called the anode and the negative electrode is called the cathode. d) For electrolysis to occur the electrolyte must be in liquid form so that
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Agarose gel electrophoresis is a technique used in the laboratory to separate macromolecules such as nucleic acids and proteins. Electrophoresis can take a mixture of macromolecules of different molecular weights‚ shapes‚ and various electrical charges to determine all the various compounds in the mixture and allowing for further purification that can aid in details of individual elements of the mixture being studied. Agarose gel electrophoresis is a very important technique used in the field of
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and determined that the magnitude of the electric force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. Coulomb’s law or Coulomb’s inverse-square law is a law of physics describing the electrostatic interaction between electrically charged particles Where Q1 represents the quantity of charge on object 1 (in Coulombs)‚ Q2 represents the quantity of charge on object 2 (in Coulombs)‚ and d represents
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Electricity is the set of physical phenomena associated with the presence and flow of electric charge. Electricity gives a wide variety of well- know effects such as lightning‚ static electricity‚ electro magnetic induction and the flow of electrical current. In addition‚ electricity permits the creation and reception of electromagnetic radiation such as radio waves. Electrical phenomena have been studied since antiquity‚ though advances in the science were not made until the seventeenth and eighteenth
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insulator also known as a dielectric between the plates. We do not want the plates to be touching‚ because then we would only have a conductor. The insulator between the plates is also known as the dialectic‚ which affect how the capacitor will store charge. In an RC circuit‚ voltage will flow from the battery to the capacitor and through the resistor. When the capacitor is charging‚ the voltage across the battery is decreasing until the capacitor is fully charged. When the capacitor is fully charged
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done in this booklet. This document consists of 24 printed pages. IB10 06_9702_11/5RP © UCLES 2010 [Turn over www.XtremePapers.net 2 Data speed of light in free space‚ permeability of free space‚ permittivity of free space‚ elementary charge‚ the Planck constant‚ unified atomic mass constant‚ rest mass of electron‚ rest mass of proton‚ molar gas constant‚ the Avogadro constant‚ the Boltzmann constant‚ gravitational constant‚ acceleration of free fall‚ c = 3.00 × 108 m s–1 µ0 = 4π × 10–7
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