developed by Sir Isaac Newton. Newton’s theory remained in force for more than 100 years and took precedence overHuygens’ wave front theory‚ partly because of Newton’s great prestige. However when the corpuscular theory failed to adequately explain the diffraction‚ interference and polarization of light it was abandoned in favour of Huygen’s wave theory.[1] Newton’s corpuscular theory was an elaboration of his view of reality as interactions of material points through forces. Note Albert Einstein’s description
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Rosalind Franklin created the A and B forms of DNA. She developed a method in seperating the two forms of DNA. Franklin provided the first pure enough DNA crystals to reveal interpretable diffraction patterenWWWWWWWWWWWW WWWWWWWWWs. She discovered the helical structure of DNA has two strands. She was missing an important piece to her structure.The missing piece was how the bases paired on the inside of the helix‚ and the secret of heredity itself (Ardell 1). Watson and Crick were
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There are two contrasting views that light either consists of particles or waves. Light is a perplexing phenomenon puzzled by Ancient Greeks and scientists for years. Even Issac Newton developed incorrect theories on light‚ when he was the inventor and genius behind physics. It has been proved that light can be both a particle and a wave. Human eyes collect light that is reflected from a source. For example‚ the light from a pencil comes from the source of light in the sun and travels to the pencil
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discharge tube brought about a calculated refractive index closest to the theoretical value. I. Introduction The spectrometer is an instrument for analyzing the spectra of radiations. A prism refracts the light into a single spectrum‚ whereas the diffraction grating divides the available light into several spectra. Because of this‚ slit images formed using a prism are generally brighter than those formed using a grating. Spectral lines that are too dim to be seen with a grating can often be seen using
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Peter Debye and his Contributions to Chemistry Abstract Dutch physicist Peter Debye studied under Arnold Sommerfeld‚ and developed several approaches using induced dipole moments and x-ray diffraction to study molecular structures. In 1912 he exhibited the Debye equation for dipole moments‚ a method to determine bond angles and the degree of polarity of covalent bonds‚ which allows the spatial configuration of molecules to be deduced with far greater accuracy than had previously
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SYNTHESIS OF STRONTIUM HEXAFERRITE SUBSTITUTED WITH TITANIUM AND ZINC NANOPARTICLES BY SOL-GEL METHOD AND ITS CHARACTERIZATION BY PAVITRA THIRUCHELVAM SCHOOL OF ARTS AND SCIENCE TUNKU ABDUL RAHMAN COLLEGE KUALA LUMPUR 2012/2013 SYNTHESIS OF STRONTIUM HEXAFERRITE SUBSTITUTED WITH TITANIUM AND ZINC NANOPARTICLES BY SOL-GEL METHOD AND ITS CHARACTERIZATION BY PAVITRA THIRUCHELVAM A project report submitted to the School of Arts and Science in partial fulfilment of the requirement for the Bachelor
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Reviewer’s Name: Sanjeev Mishra UMN ID Number: 4585009 The Photoelectric Effect: A Determination of Planck’s constant Ian E. Jaeger School of Physics and Astronomy‚ University of Minnesota – Twin Cities 116 Church St. S.E.‚ Minneapolis‚ MN 55455 Abstract The photoelectric effect was explored to determine an experimental value of Planck’s constant‚ h. Included is a brief introduction to the history leading up to Einstein’s discovery of the photoelectric effect as well as the theory behind
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spectra of various chemical elements obtained by diffraction in crystals. * The Moseley’s law. * Periodic Table. * Early X-ray crystallography * development of early X-ray spectrometry equipment * Moseley’s discoveries resulted in a more accurate positioning of elements in the Periodic Table by closer determination of atomic numbers. * He observed and measured the X-ray spectra of various chemical elements obtained by diffraction in crystals. Through this he discovered a systematic
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what side of the energy spectrum their wavelengths are on. Materials: • Hydrogen lamp • Mercury lamp • 2 diffraction devices • Flashlight • Paper • Pencil • Calculator Procedure: 1. Place the hydrogen lamp in the power source and turn it on 2. Do the same thing with the mercury lamp on a separate table 3. Look through the diffraction device and look at several colorful lines 4. Record the colors of the lines and what element they were for on a sheet
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different sizes (7‚ 29‚ and 89 nm mean values) were synthesized using gallic acid in an aqueous chemical reduction method. The nanoparticles were characterized using transmission electron microscopy (TEM)‚ dynamic light scattering (DLS)‚ X-ray diffraction (XRD)‚ and ultraviolet–visible (UV–Vis) absorption spectroscopy; the antibacterial activity was assessed using the standard microdilution method‚ determining the minimum inhibitory concentration (MIC) according to the National Committee for Clinical
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