SEMICONDUCTOR a solid substance that has a conductivity between that of an insulator and that of most metals‚ either due to the addition of an impurity or because of temperature effects. Devices made of semiconductors‚ notably silicon‚ are essential components of most electronic circuits. 1. A semiconductor is a material which has electrical conductivitybetween that of a conductor such as copper and that of an insulatorsuch as glass. semiconductor is a material whose electrical conductivity is
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light hits it. Classical mechanics says that electrons will be emitted from a metal by light waves with any frequency as long as the intensity of the light is strong enough‚ and even if it is weak over a long enough period of time electrons will eventually be emitted. The theory was proved incorrect after experiments showed that light under certain frequencies did not produce the photoelectric effect on the metal‚ which meant that the emitting of electrons is related not to intensity but the waves
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Introduction: Some metals such as copper‚ silver and gold are very good conductors of electricity. This is because they all have only one electron on the outer shell. This means that they need only a tiny amount of energy in order to allow the electron to move. Non-metals‚ however‚ do not have free electrons‚ so even non-metals that only have one electron on their outer shell can still hold onto them tightly. Aim Of The Investigation: The aim of the investigation is to find out if there is a
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are Answer electrons. Comments Correct!! Max Score: 5 Actual Score: 5 Question 2 The structural unit that retains the properties of an element is the Answer atom. Comments Correct!! Max Score: 5 Actual Score: 5 Question 3 Which of the following are found in the nucleus of an atom? Answer A and B Comments Correct!! Max Score: 5 Actual Score: 5 Question 4 The component of an atom or molecule that is most important in determining its chemical properties is the Answer electron. Comments Correct
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Unit 1 What is inside an atom? * A positively charged nucleus composed of protons and neutrons * Electrons that surround the nucleus What are isotopes? Isotopes are atoms with the same number of protons and different numbers of electrons How do we represent different atoms? What is specific charge? The specific charge of a particle is defined as its charge divided by its mass What keeps protons and neutrons in a nucleus together? A stable isotope has nuclei that do not disintegrate
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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 nucleus of x Bh? y A B C D 267 261 160 154 3 Which set of radioactive emissions corresponds to the descriptions given in the table headings? high-speed electrons A B C D α α β β high-speed helium nuclei
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Project Report Use of Lithium Iron Phosphate for Improvement of Lithium Ion Battery safety and Efficiency Synthesis‚ Characterization and Applications Mentor: Dr. Teyeb Ould Ely Guide: Dr. Richa Krishna Dhritiman Chakraborty A1217413001 MSMT Nanotechnology IInd Year Semester 3 Characterization: Raman Spectroscopy From the above chart it is clear that the material synthesized was not LiPO4. The XRD done later confirms this. Characterization: X-Ray Diffraction Table3.1. Synthesis
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characteristics. * 1897: JJ Thomson discovered electron and isotopes‚ and invented the mass spectrometer. * 1898: Marie Curie discovered and isolated radium‚ a new element which unprompted disintegrated into other elements. This proved that the atoms of one element at least were not indivisible. * 1911: Ernest Rutherford established that the nucleus was very dense‚ very small and positively charged. He also assumed that the electrons were located outside the nucleus. * 1922: Niels
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Lightning Perhaps the most known and powerful display of electrostatics in nature is a lightning storm. Lightning storms are inescapable from humankind’s attention. They are never invited‚ never planned and never gone unnoticed. The rage of a lightning strike will wake a person in the middle of the night. They send children rushing into parent’s bedrooms‚ crying for assurance that everything will be safe. The fury of a lightning strike is capable of interrupting midday conversations and activities
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integrated into most electronic and portable devices. Electrical current is the flow of electrons (movement) of an electrical charge and is measured using an ammeter. Solid conductive metals contain large population of free electrons‚ which are bound to the metal lattice and move around randomly due to thermal energy. When two terminals of a voltage source (battery) are connected via a metal wire‚ the free electrons of the conductor drift toward the positive terminal‚ making them the electrical current
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