Lecture 4 Density of States and Fermi Energy Concepts Reading: (Cont’d) Notes and Anderson2 sections 2.8-2.13 Georgia Tech ECE 3080 - Dr. Alan Doolittle How do electrons and holes populate the bands? Density of States Concept In lower level courses‚ we state that “Quantum Mechanics” tells us that the number of available states in a cubic cm per unit of energy‚ the density of states‚ is given by: * * mn 2mn ( E Ec ) gc (E) ‚ E Ec 2 3 gv (E) m * 2 m * ( Ev E )
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persistent condition of surface waters and a widespread environmental problem (Carpenter‚ 2005). The main cause is excessive loading into the system of phosphorus and nitrogen‚ resulting in high algal biomass‚ dominance by cyanobacteria‚ and loss of macrophytes (Dixit‚ 2005). When the nutrient concentrations rise to extremely high levels‚ eutrophication occurs. There are two stages‚ which begin with the algal bloom. Algal bloom creates a barrier at the surface of the water‚ which prevents sunlight from
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What is the more accurate way to measure volume‚ by using displacement or by using a ruler? Hypothesis: If the method of displacement is used ‚ then the results will be more accurate than measuring the volume using a ruler. Materials: -250 mL graduated cylinder -Triple beam balance -A weigh boat -Ruler -Samples Procedure: 1. Gather materials such as ‚ samples‚ weigh boat‚ triple beam balance ‚ graduated cylinder‚ ruler and water. 2. Take the materials to where to a work area. 3. Zero
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Research: The word density means the degree of compactness of a substance. There is density in everything in your everyday life (matter.)The formula to find density is d=m/v.The density of solids and liquids is usually stated as g/cm3‚ while gases are usually stated as kg/m3. A real life example of density would be that ice floats on water because it is less dense than water‚ or it sinks because it is more dense than water. The only substance that breaks this rule is ice. Archimedes was
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Abstract Bolt thread experiment was conducted to examine the major diameter‚ minor diameter‚ angle and the pitch of the bolt thread. Other than that‚ the purpose of this experiment is to compare the measured data with the standard thread from literature. The experiment was carried out by taking the measurement using optical projector. The shadow or the image of the bolt is traced and magnified on the broad of the optical profile projector. The crest and the toot of the bolt thread were picked to
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reactivity series is a list of metals arranged in order of their reactivity based on displacement reactions‚ reduction of their oxides by hydrogen or carbon‚ the relative ease of decomposition of their compounds and reactions with oxygen‚ dilute acids and water. The higher up a metal is in the reactivity series‚ the more reactive it is. In the experiment conducted‚ the three metals‚ magnesium‚ zinc and copper each had to undergo displacement reactions and reactions with water‚ oxygen and dilute acids
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WHAT IS METAL? A metal is a chemical element that is a good conductor of both electricity and heat. Metals are malleable and ductile and have lustrous appearance. They have moderate to high physical constants and high tensile strength. Metals are further divided into two main groups - ferrous and non ferrous metals. TYPES OF METAL • FERROUS METAL These are metals which contain iron. They may have small amounts of other metals or other elements added‚ to give the required properties
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PHYSICAL PROPERTIES: DENSITY Introduction According to the definition Density is the physical property that allows us to compare the mass of substances for a specific volume. In this Lab activity that took place in Deree College‚ Agia Paraskevi Campus we deal with the density of solids and density of liquids. The main purpose of this experiment is to understand what in reality density means‚ how we can measure it‚ how useful it is‚ what is the difference between density of solids and liquids
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determine density of both regular and irregular shaped objects. Throughout the lab I found out that both of the small and large silver rod‚ do not have the same density‚ and also found out that the gold rod is not real gold. My hypothesis is that since‚ the large and small silver rod has about the same density I believe that they would have about the same amount of volume. They both might displace the same amount of water on the graduated cylinder. The Materials we used throughout the lab was: Metal rods
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Browning X Bolt is not a plain ole rifle. This is one of the “premium” hunting rifles on the market. I recently hunted with an X-Bolt Composite Stalker in .30-06 and I seriously liked it. Introduced in 2009‚ the X bolt stands as a much more sophisticated version of the company’s A-Bolt‚ which was introduced in 1985. There are still some similarities between the two. In fact‚ both the A bolt and X Bolt are push-feed. Both of them are bold and action packed hunting rifles perfect for deer‚ elk or other
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