Physics 215 Winter 2002 Introduction to Modern Physics Prof. Ioan Kosztin Lecture #23 Solid State Physics • Bonding in solids (metals‚ isolators‚ semiconductors) • Classical free electron theory of metals • Quantum theory of metals • Band theory of solids • Semiconductors • Lasers Classification of solids • Phases of matter: • solid (well defined shape and volume) • liquid (only well defined volume) • gas (no defined shape or volume) • plasma (an overall neutral collection of charged
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the atomic mass scale) of the fundamental particles - protons‚ neutrons and electrons. * State that atoms have a dense positively charged nucleus (consisting of protons and neutrons) around which move negatively charged electrons. * State that an element is identified by its atomic number (Z)‚ which is the number of protons in the nucleus and determines the number of electrons in a neutral atom of the element. *
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----------------------- 1869‚ Dmitri Mendeleev • Used cards to arrange the elements and created the first periodic table. Late 1890s‚ Joseph John Thompson • Discovered electrons using cathode ray test tube experiments • “Plum pudding” model of atoms (1900)– negative electrons in a positive framework 1800‚ John Dalton‚ English chemist: • Proposed the atomic patterns‚ which account for the law of conservation of mass and the law of constant composition
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more electrons you have‚ the more electricity you will get. Batteries are expensive‚ but you can make one for exactly 24 cents! In this experiment‚ you will make your own voltaic pile using pennies and nickels. In the data‚ we will see if the number of pennies and nickels will affect the number of voltage and current. Problem How many coins in the pile will make the most electricity? Hypothesis If there are more coins‚ then the more electricity it can produce‚ because the more electrons you
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BCMB 311‚ Advanced Cell Biology‚ Fall 2012 EXAM 1 __________________________________Name True-False Questions (Write T or F next to the question‚ 1 point each) 1. A globular protein in the cytoplasm will normally be folded up in such a way that most of its non-polar sidechains are buried in the interior of the protein and most of its polar and charged side-chains are exposed on its surface. T 2. Alpha helices are stabilized by hydrogen bonds between amino acid side chains‚ whereas beta
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taking the electrons from the bond with it. The more stable the leaving group as an independent assemblage‚ the more readily it will depart the molecule. Carbocation: A carbon with only 6 shared valence shell electrons. A full positive charge resides on the carbon. Carbocations are electrophiles. Nucleophile: An atom or assemblage of atoms which will donate electrons to form a new covalent bond. Strong nucleophiles are strong Lewis bases. Electrophile: An atom which will accept electrons and form
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Atomic Theory Essay We are first going to talk about Protons‚Neutrons and Electrons. These three elements are a very good example of most things that are in use of gas fumes. It all started when Protons and neutrons where‚ Protons were discovered by Experimenting with discharging tubes. Eventually they found out the rest of the Atoms over time. Which brings me into the word of Orbital. Orbital is a Neutron‚ electron or a proton Going around a single atom with certain amounts of energy levels. Which
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COE CHEMONE Reviewer for CHEMONE Finals Rules for Counting Significant Figures 1. Nonzero integers. Nonzero integers always count as significant figures. 2. Zeros. There are three classes of zeros: a. Leading zeros are zeros that precede all the nonzero digits. These do not count as significant figures. In the number 0.0025‚ the three zeros simply indicate the position of the decimal point. This number has only two significant figures. Note that the number 1.00 _ 102 above is written in exponential
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crystalline surfaces including both atomic structures and electron arrangement. The STM tip produced in this experiment acts as a needle that hovers above the crystalline material surfaces (perfect atomic structural patterns) with nanoscale accuracy‚ while emitting electrons from a few nanometers above the surface of the crystalline materials‚ utilizing the quantum tunneling effect to scan the surface atoms and electrons. In classical physics; electrons would not be able to pass through certain conductive
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University‚ and let ‘A’ denote the event that the selected individual has a Visa Credit Card and the ‘B’ analogous event for a Master Card. Suppose that P(A)=0.5; P(B)=0.4; P(AB)=0.25 a. Compute the probability that the selected individual has at least one credit card. b. What is the probability that the selected individual has neither type of card? c. Describe in terms of A and B‚ the event that the selected student has a Visa Card but not a Master Card and then calculate the probability of this event
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