The following is a project made by anonymous: INTRODUCTION The general purpose photoconductive cell is also known as LDR – light dependent resistor. It is a type of semiconductor and its conductivity changes with proportional change in the intensity of light. There are two common types of materials used to manufacture the photoconductive cells. They are Cadmium Sulphide (CdS) and Cadmium Selenide (CdSe). Extrinsic devices have impurities added‚ which have a ground state energy closer to the conduction
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third and the fourth weren’t that bad. I don’t recall getting sick any other times. I did experience some side effects from radiation. The typical side effects were discoloration‚ and somewhat of a sunburn‚ as to be expected. But aside from the physical effects on the breast tissue itself‚ I was very tired. I had my radiation treatments every morning‚ and once I left radiation‚ I would go straight back to class. But during that time I started to take vitamins so that it would increase my energy. I
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Islam Attalla Dr. Held BL 126.01 11 November 2010 Toxicology Environmental Toxicology is a young (1965) and interdisciplinary science that uses both basic and applied scientific knowledge to understand natural and human caused pollutants‚ life cycle and their impacts upon structure and functions of biological and ecological systems. Research in Environmental Toxicology includes both laboratory experiments and field studies. The main purpose of Environmental Toxicology wants to answer two main
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V.Naga Prathap III B.Tech AEROSPACE DEPARTMENT‚ SRM UNIVERSITY‚ KATTANKULATHUR‚ TAMILNADU 1.snehalakshmirksl@yahoo.in 2. ngprthp81@gmail.com 1. +917845240907 2. +919176796262 ABSTRACT: Every square meter of space receives 1.366KW of solar radiation which is beamed down to earth has been reduced to 250W per square meter due to atmospheric absorption and other factors. This has led to the idea of setting up a space solar power station (SSPS) which can produce energy up to seven times that
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XRD – X-Ray Diffraction X-ray diffraction (XRD) is a powerful non-destructive technique for characterizing crystalline materials. It provides information on structures‚ phases‚ preferred crystal orientations (texture)‚ and other structural parameters‚ such as average grain size‚ crystallinity‚ strain‚ and crystal defects. X-ray diffraction peaks are produced by constructive interference of a monochromatic beam of X-rays scattered at specific angles from each set of lattice planes in a sample. The
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The World Communicates 1. The wave model can be used to explain how current technologies transfer information * describe the energy transformations required in one of the following: mobile telephone‚ fax/ modem‚ radio and television Energy transmission in mobile telephone: sound wave energy (input sound) -> electrical (in transmitting phone) – > radio wave (transmit signal) -> electrical (in receiving phone) -> sound (output sound) * describe waves as a transfer of energy disturbance
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oscillation that ranges from 3 KHz to 300 GHz and work hand in hand with the frequency of the radio waves and the fluctuation currents that carry radio signals. Radio Frequency has different types of properties but ones that are most important are the radiation of electromagnetic waves cause by the energy in a RF current. Usually an electromagnetic wave is the main base of what is known to be Radio Technology. RF can be found emitting around conductors of electrical currents‚ they are usually not found
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Examples of Radiant Energy The term radiant energy refers to energy that travels by waves or particles‚ particularly electromagnetic radiation such as heat or x-rays. Radiant energy is created through electromagnetic waves and was discovered in 1885 by Sir William Crookes. Fields in which this terminology is most often used are telecommunications‚ heating‚ radiometry‚ lighting‚ and in terms of energy created from the sun. Radiant energy is measured in joules. Ads by Google Best Solar Investments
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Basic Physics Content with Answers 1. In the absence of air resistance‚ a ball of mass m is tossed upward to reach a height of 20 m. At the 10m position‚ half way up‚ the net force on the ball is A. 2mg. B. mg. C. mg/2. D. mg/4. B is correct‚ as a vector diagram would show. Other choices show carelessness or confusion between force and speed‚ and what constant acceleration means. 2. When you drop a ball it accelerates downward at 9.8 m/s2. If you instead throw it downward‚ then its acceleration
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An adventure into Astronomy Late at night I like to go into my backyard with a telescope and look at the stars that far away in the night sky. The view of thousands of stars feeds me with wonder and amazement about both the stars origins‚ and what treasures they may hold floating around them. All life needs a host star to form around‚ and all life comes from the ashes of these once glorious masses of gas. Astronomy offers us a great view of the universe around us‚ you can join me and others‚
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