Overview A transistor is a semiconductor device that amplifies and switches electrical currents. They are the core component of any modern electronic devices‚ such as computer‚ telephones and other electronics. Nowadays most transistors are use to produce integrated circuits. There were a numerous inventions‚ or problems with the inventions that lead to the birth of the transistor. Radio signals‚ could be sent carrying information over a long distance away; the only problem was there was no device
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1 1 The nucleus of one of the isotopes of nickel is represented by 60 Ni. 28 Which line in the table correctly describes a neutral atom of this isotope? number of protons A B C D 28 28 60 60 number of neutrons 32 60 28 32 number of orbital electrons 28 28 28 32 2 A nucleus of bohrium x Bh decays to mendelevium y emissions. bohrium x Bh → dubnium + α y → lawrencium + α 255 Md 101 by a sequence of three α-particle → mendelevium 255 Md + α 101 How many neutrons are there in a
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Argon (Ar) is a noble gas found in Group 0 on the periodic table. It gets its name because of its chemical inertness and comes from the Greek root ‘Argo‚’ which means lazy. This is because Argon doesn’t react well with other elements. The atomic number of Argon is 18 making it a member of the helium group of elements which are also called noble‚ or inert‚ gasses and are non reactive. Its electronic configuration is: 1s2 2s2 2p6 3s2 3p6 The outermost shell‚ shell number three‚ has a completely
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General Chemistry Paper on Chemical Elements: Helium Jensen Vu Rabun Gap-Nacochee School Helium is an element in the periodic table. It has the symbol He and an atomic number of 2. Its average atomic mass is about 4.002602 u. There are 7 known isoptopes of helium‚ bearing the electron configuration 1s2. The ionic radius of this element is 93 pm. Helium was first observed and found by French astronomer Pierre Jules César Janssen along with the scientist Joseph Norman Lockyer in 1868‚ adding one
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Name _________________________________________ Date _________________________ Period ____ Homework Chapter 7: Electronic Structure of Atoms Exercises: Sections 7.4‚ 7.5 : Ionization Energy and Electron Affinities 1. Write equations that show the process for (a) The first two ionization energies of gallium; first: Ga(g) → Ga+(g) + 1 e– second: Ga+(g) → Ga2+(g) + 1 e– (b) the fourth ionization energy of rhodium. fourth: Rh3+(g) → Rh4+(g) + 1 e–
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Terminology[edit] An integrated circuit is defined as:[2] A circuit in which all or some of the circuit elements are inseparably associated and electrically interconnected so that it is considered to be indivisible for the purposes of construction and commerce. Circuits meeting this definition can be constructed using many different technologies – see for example thin-film transistor‚ thick film technology‚ or hybrid integrated circuit. However‚ in general usage integrated circuit has since come
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the purpose of rectifying waveforms‚ and can be used within power supplies or within radio detectors. They can also be used in circuits where ’one way’ effect of diode is required. Most diodes are made from semiconductors such as silicon‚ however‚ germanium is also used sometimes. Diodes transmit electric currents in one direction‚ however‚ the manner in which they do so can vary. Several types of diodes are available for use in electronics design. Some of the different types are: Light Emitting
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1/ what is the essential difference between alternative energies (AE) and fossil fuels? Alternative energies will not have a lot of pollution‚ but fossil fuels will cause some pollution of the environment. Some fossil fuels causes environmental pollution‚ for example‚ global climate change‚ a lot of carbon dioxide cause the greenhouse effect‚ acid rain emissions of harmful gases cause serious pollution to the atmosphere. 2/ name the AE that you have chosen to research. Solar Energy 3/ identify
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constructed from semiconductors. The anode is the positive terminal and the cathode the negative terminal. LED= light emitting diode a diode which emits light. Semiconductor materials Silicon is the most commonly used semiconductor in electronics‚ germanium is also used. These elements form a stable crystal lattice‚ with each atom sharing its four outer electrons (called valence electrons) with neighbouring atoms. Silicon is a poor conductor because the outer electrons in each atom are held firmly in
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Fiber Optics History of Fiber Optics History Of Fiber Optics In 1870‚ John Tyndall‚ using a jet of water that flowed from one container to another and a beam of light‚ demonstrated that light used internal reflection to follow a specific path. • Alexander Graham Bell patented an optical telephone system‚ which he called the Photophone • He dreamed of sending signals through the air‚ but the atmosphere didn’t transmit light as reliably as wires carried electricity. • During the 1920s‚ John
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