INTRODUCTION Radiation‚ flow of atomic and subatomic particles and of waves‚ such as those that characterize heat rays‚ light rays‚ and X rays. All matter is constantly bombarded with radiation of both types from cosmic and terrestrial sources. This article delineates the properties and behaviour of radiation and the matter with which it interacts and describes how energy is transferred from radiation to its surroundings. Considerable attention is devoted to the consequences of such an energy
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spectra to enable long-distance transmission of data over optical fibres; they also ensure narrow spot-size laser read/write beams in CD and DVD players. In quantum optical devices‚ microcavities can coax atoms or quantum dots to emit spontaneous photons in a desired direction or can provide an environment where dissipative mechanisms such as spontaneous emission are overcome so that quantum entanglement of radiation and matter is possible. Applications of these remarkable devices are as diverse
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Name:____________________________ Date:_____________________ Period:_______ Chemistry Chapter 5 Review: 1. How does the energy of an electron change when it moves closer to the nucleus? 2. The principle quantum number indicates what property of an electron? 3. What shape are s orbitals and p orbitals? 4. What is the maximum number of f orbitals in one energy level of an atom? 5. What is the maximum number of d orbitals in one principal energy level of an atom? 6. What is the maximum number
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visible light are but two examples‚ has properties of both waves and particles. When light acts as a particle‚ called a photon‚ each light particle possesses a discrete amount of energy called a quantum. When a molecule is exposed to electromagnetic energy it can absorb a photon‚ increasing its energy by an amount equal to the energy of the photon. The energy of the absorbed photon can be calculated if the frequency‚ ν‚ (the symbol‚ ν‚ is a Greek letter‚ pronounced nu) of the light is known according
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Light Absorption by Photosynthetic Pigments in Silver Beet Abstract The aim of the experiment was to determine the absorption of differing wavelengths of light by individual pigments in the vegetable silver beet. Pigments were extracted from silver beet leaves and separated into chlorophyll a‚ chlorophyll b‚ and carotene via chromatographs. Chlorophylls were then separated and an absorption spectra created using results obtained from a spectrophotometer. It was clear there were two distinct peaks
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_________________ –13.60 eV (a) The level‚ n = 1‚ is the ground state of the atom. State the ionisation energy of the atom in eV. answer = ................................... eV (1 mark) 1 (b) When an electron of energy 12.1 eV collides with the atom‚ photons of three different energies are emitted. 1 (b) (i) On Figure 1 show with arrows the transitions responsible for
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incoming photon excites the atomic system from a lower energy state into a higher energy state. This is called absorption or sometimes stimulated absorption. E2 (Absorption) E1 Spontaneous Emission: Once the atom or molecule goes in its excited state‚ there is a probability that it will emit radiation again and return to a lower energy state thus a photon is emitted. In this emission process‚ where the atoms spontaneously goes to a lower energy state through the emission of a photon is called
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CGHS Physics Trial HSC Examination 2008 Page 1 Student number ……………………….. Teacher …………………………………….. Cheltenham Girls High School 2008 Higher School Certificate Trial examination Physics TASK WEIGHTING: 35% General Instructions • Reading time – 5 minutes • Working time – 3 hours • Write using black or blue pen • Draw diagrams using pencil • Board-approved calculators may be used • A data-sheet‚ formulae sheets and Periodic Table are provided at the back of this paper Total marks –
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What is electromagnetic radiation? Electromagnetic energy is a term used to describe all the different kinds of energies released into space by stars such as the Sun. These kinds of energies include some that you will recognize and some that will sound strange. They include: * Radio Waves * TV waves * Radar waves * Heat (infrared radiation) * Light * Ultraviolet Light (This is what causes Sunburns) * X-rays (Just like the kind you get at the doctor’s office) * Short waves
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is the speed of the wave: Photon Relationship between frequency and photon energy Planck’s Assumption: Photons have momentum but no mass Momentum of photon As wavelength increases of a photon‚ frequency decreases and energy decreases. As wavelength decreases of a photon‚ frequency increases and energy increases. Photoelectric effect Shining light on a metal causes electrons to be emitted Below some frequency‚ no photons are emitted regardless of intensity of
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