Lab 1: Flame Test 11 Chemistry‚ university Preparation Conducted: September 20th‚ 2010 Purpose: To observe‚ and create a chart of the colours produced when solutions of known metal compounds are heated to high temperature. Question: What colours are produced when different metallic compounds are placed in a flame‚ and why this happens? Hypothesis/Prediction: Different salts will produce different colours when placed in a flame‚ due to the fact that each element has a different
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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 in the form of photons. This effect is called electroluminescence and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. A LED is often small in area (less than 1 mm2)‚ and integrated optical components may be used to shape its radiation pattern.[8] LEDs
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Introduction There are many dates in history that would make the world a better place if they did not happen. This list includes assassinations of Presidents Lincoln and Kennedy‚ WWI‚ WWII and 9/11. In the modern world that we live in there is no way to change these events. But if there were a way you could actually do it‚ would it be possible? There are some theories about this. They are only theories because there is no way to test them at this point in time. One of these theories is that it
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NOVA: Secrets of the Sun 1. Solar storms take place in two stages. The first stage is the solar flare which “releases an outburst of x-rays.” (NOVA) The second stage is the coronal mass ejection‚ with is a “wave of billions of tons of electrically charged particles.” (NOVA) 2. Auroras can be very bright. In fact‚ in 1859 there were reports that miners in Colorado were awaken by an aurora in the middle of the night. Believing that dawn had arrived‚ they went to work early. 3. During the 1960’s
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variety into the chemistry of organic molecules. Suitability of the C-C bond for building the molecules of life can be seen by comparing its bond energy with energy in sunlight. The energy present within the spectrum ranges from 170-270kj/ml of photons –insufficient to break double carbon bonds. IF this were not so‚ the light would break carbon compounds spontaneously so life as we know it would not exist.
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Astronomy flash cards Term Which of the following has your "address" in the correct order?A) you‚ Earth‚ solar system‚ Milky Way‚ Local Supercluster‚ Local GroupB) you‚ Earth‚ Local Group‚ Local Supercluster‚ solar system‚ Milky WayC) you‚ Earth‚ solar system‚ Milky Way‚ Local Group‚ Local SuperclusterD) you‚ Earth‚ solar system‚ Local Group‚ Local Supercluster‚ Milky WayE) you‚ Earth‚ solar system‚ Local Group‚ Milky Way‚ Local Supercluster | | Definition C) you‚ Earth‚ solar system‚ Milky
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wavelengths of light are defined by the Rhydberg Equation. The integer numbers nf and ni turn out to be the “quantum numbers” of the orbits‚ counting outwards from the nucleus. c) Use Plank’s Equation to calculate the energy carried by one photon of light in the Hδ spectral line. E = h.f = 6.63x10-34 x 7.32x1014 = 4.85x10-19 J. • Electrons in “allowed orbits” have quantised amounts of angular momentum too. Bohr figured out that the amount of angular momentum possessed by an electron
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\caption[Different monochromatic $\gamma$ selection criteria is explained in the first column] { Different monochromatic $\gamma$ selection criteria are given in the first column. The resulting efficiencies using different monochromatic cuts are given in the second column. The number of the reconstructed $\omega\to\pi^0\gamma$ decays ($N_{\omega\to\pi^0\gamma}^{rec}$) for different monochromatic cuts are presented in the third column. The measured branching ratio $BR^{measured}_{\omega\to\pi^0\gamma}$
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Spring 2014 UROP Proposal Ian Jaeger Background During the first 379‚000 years (redshift z = 1089) after the Big Bang‚ the matter of the universe consisted primarily of free protons‚ electrons and photons. After the matter had cooled and spread out‚ these particles combined to form hydrogen and allowed the photons to freely travel without interacting with free electrons‚ forming what we know of today as the Cosmic Microwave Background (CMB). Between 150 million and 1 billion years after the Big Bang (6
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increase local tumor control. Developments in radiation oncology are always aiming at an increase precision of dose delivery: More conformal coverage of target volumes‚ steep dose gradients to surrounding tissues‚ and sparing of organs at risk (OAR). In photon therapy‚ based on 3D-RT‚ stereotactic radiotherapy was a big step in the direction of more precision. Tightly conformal dose distributions and a sharp dose fall-off to normal tissue were the main benefits. With this‚ high single doses can be applied
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