assessment criteria 5 and 6 The Photoelectric effect‚ and the Production of Light In 1887 Hertz discovered the photoelectric effect‚ where electrons were emitted from a zinc surface when illuminated with ultra-violet light. These electrons (called ‘photoelectrons’) were only emitted when the frequency of the ultra-violet light was above a certain value (called the ‘threshold frequency’). Criteria 5c Assume that ultra-violet light is falling onto a piece of zinc‚ and photoelectrons are being emitted
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that played an important part in this production was the lighting. The Lighting crew put an old light fixture in the middle of the room of the set. One light worked and there was one blown out. This gave the audience an even better idea of the characters and their life. The one working light bulb showed the economic stature of the two brothers. Also‚ there were breaks in the scenes where the lights would go out for the characters to leave the stage and get prepared.
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air. Its three hours after nine And he was very scared. The air had no light. He was all alone. He was filled with fright‚ And couldn’t find his way home. With nowhere to go‚ He stopped and lay down‚ The woods were nothing he’d know‚ Which caused him to frown. then there was a flare‚ Coming from afar‚ Going to it was his dare‚ Like him following a star. He found the source of the light‚ Was a man with a light so bright And boy was at his surprise‚ How he gained his lost life. By:
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sTraffic lights‚ also known as traffic signals‚ traffic lamps‚ signal lights‚ robots in South Africa[1] and‚ in the past‚ semaphores‚[2] are signalling devices positioned at road intersections‚ pedestrian crossings and other locations to control competing flows of traffic. Traffic lights were first installed in 1868 in London[3] and are now used all over the world. Traffic lights alternate the right of way accorded to road users by displaying lights of a standard color (red‚ yellow/amber‚ and green)
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tremendous energy saving opportunities in this area. The simplest and the most widely used form of controlling a lighting installation is "On-Off" switch. In the electrical lighting system in our community‚ especially in the various households and the street lighting system‚ it will be observed that lots of electrical power is being wasted as a result of negligence and ineffectiveness on the part of our local power authority (PHCN)‚ State electricity board‚ parastatals in charge of electric power management
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ISSN (Print) : 2320 – 9798 ISSN (Online): 2320 – 9801 International Journal of Innovative Research in Computer and Communication Engineering Vol. 1‚ Issue 2‚ April 2013 New Epoch of Wireless Communication: Light Fidelity Megha Goyal1‚ Dimple Saproo2‚ Asha Bhagashra3 Assistant Professor‚ Dept. of ECE‚ Dronacharya College of Engineering‚ Gurgaon‚ India1 Associate Professor‚ Dept. of ECE‚ Dronacharya College of Engineering‚ Gurgaon‚ India2 M.Tech Student‚ Dept. of ECE‚ Shekhawati Engineering
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the Study Street food is ready-to-eat food or drink sold in a street or other public places‚ such as a market or fair‚ by a vendor‚ often from a portable stall. Most street foods are classed as both finger food and fast food‚ and are cheaper on average than restaurant meals. According to a 2007 study from the Food and Agriculture Organization‚ 2.5 billion people eat street food every day. In the Philippines it is easy to prepare and eaten and consequently have become the staples of street vendors
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Street racing is an illegal sport that is growing popular at an alarming rate. Street racing is the concept of high performance automobliles racing on public roadways illegally. Individuals will take a basic car and tune it up to be very quick and very powerful. The idea of street racing originates from the legal sport of drag racing. Drag racing is an internationally recognized sport governed by the NHRA‚ the National Hot Rod Association. Drag racing consist of two drivers in separate cars
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Introduction Street racing has been identified as a threat to civil society with significant social and economic impact . Street racing is illegal in Malaysia ‚ as reckless stunts on public roads endanger the lives of many . One of Malaysia ’ s subcultures include the ‘ Mat Rempit ’ biker gangs ‚ estimated to be over 200‚000 which comprise of bikers who either take to illegal racing in large numbers or perform extremely dangerous
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Judi Lin is 19 year old former street racer. She used to tear up the streets of her hometown until she got torn up herself. "I ’ve been through six cars in the past five years‚" Lin admitted. "Two out of the six were (demolished) in street-racing accidents. Both of them were a total loss. The first one‚ I was street racing a Mustang on a rainy day and I broke my collarbone. On the second one‚ I was at the illegal street races and wasn ’t wearing my seatbelt. My forehead hit the (windshield)‚ and
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