A light-emitting diode (LED) is a semiconductor light source.[6] LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Appearing as practical electronic components in 1962‚[7] early LEDs emitted low-intensity red light‚ but modern versions are available across the visible‚ ultraviolet‚ and infrared wavelengths‚ with very high brightness. When a light-emitting diode is switched on‚ electrons are able to recombine with holes within the device‚ releasing energy
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Spoiling car owner and Traffic Jam‚ whose fault? Jakarta is capital town of Indonesia‚ the central region that well known by traffic jams problem. Traffic jam problem in Jakarta has always been a terrible problem that still difficult to solve. Jakarta is included in "The World’s 20 Cities with The Worst Traffic Jams" and Jakarta is on the 14th rank. Every single day‚ especially around 5.00 am – 2.00 am‚ simply says that the traffic start from the beginning until the end of the day. The most
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10 accidental inventions that changed the world and in fact‚ experts estimate that between 30 and 50 percent of of all scientific discoveries are in some way accidental. the following accidental inventions from the past two centuries have changed the world in one way or another. 1. Matches Many of us wonder what life was like before electricity or the Internet (shudder)‚ but imagine life before matches. We’re talking magnifying glasses and flint. For those of us who like to create controlled
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The Invention of Paper in China Introduction Have you ever thought what life would be like without paper? Have you ever considered how many uses there are for paper? What about who came up with the idea for paper and where paper came from? Paper is one of those objects that we just take for granted. For our lifetimes it has always been around. We have never knows what it would be like to have to document something on anything but paper. Prior to the invention of paper‚ what was used to record
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Electromagnetic Wave from the sun such as light usually reflects horizontally off of surfaces. This process produces a super annoying glare that polarized sunglasses restrict from affecting your eyes. 3. In your own words‚ explain why we see a rainbow or colorful sunset. Explain the properties and interactions that make this display possible. (13 points) Sunlight is actually made up of a whole range of colors but when all these colors are combine it is seen as white. When the light passes through different types
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The Green Light The green light at the end of Daisy’s dock is a significant symbol within the book. To Gatsby‚ the green light represents his dream‚ which is Daisy. To attain her would be completing Gatsby’s American Dream. The first time the green light is seen in the novel is also the first time Nick sees Gatsby. Fitzgerald writes‚ “…he stretched out his arms toward the dark water in a curious way‚ and‚ far as I was from him‚ I could have sworn he was trembling. Involuntarily I glanced seaward
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Imagine if you will‚ it is 9am and you are on your way to work. A. You get a text from a friend at work while you are driving down the road going 45 miles per hour. B. You begin to text back when you go across the median to oncoming traffic. C. You get into a head on collision with another oncoming vehicle. D. You are ejected from the vehicle and pronounced dead at the scene. II. The scene I have just described to you is what happens many times when people text and drive. III. After
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Have you ever imagined Bangkok without any traffic jams? Well‚ I have‚ many times. The amount of transport vehicles in Bangkok adds up to a striking 6.9 million‚ as for the rest of Thailand it comes to 23.4million in total. According to data and statistics from World Health Organization (WHO)‚ the number of traffic accidents (2012) in Bangkok and in the rest of the country is more or less the same. In Bangkok more personal cars are involved in accidents‚ while in the countryside pickups feature more
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Garrett Hardin first wrote “The Tragedy of the Commons”‚ and was published in his Journal in 1968‚ and it is one of the big issue World today face. He has mention tragedy of Common as exploitation of human on the environment without accounting externalities. He has given example on four herdsmen. It generally takes place from agriculture revolution and it proceeding even in post-industrial revolution whereby Hardin have concern on it. This means that common take more advantage from common resources
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History of Air Traffic Control Founded in 1987‚ the National Air Traffic Controllers Association (NATCA) represents more than 15‚000 aviation safety professionals throughout the United States‚ Puerto Rico‚ Guam and other U.S. territories. All share a common goal: protecting the safety of the flying public. These individuals are air traffic controllers‚ engineers‚ architects‚ nurses‚ health care professionals and financial and accounting professionals. In 1981‚ air traffic controllers lost
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