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Long Half-Life in Radioactive Decay
Long Half-Life in Radioactive Decay

... The temperature of Earth’s core is estimated to be ̴7,000 K. As a result, average temperature increases by about 1° F for every 70’ of depth. Most of this heat occurs from long lived radionuclides like uranium-238, thorium-232, and potassium-40. The numbers are the isotope atomic weights. The rest c ...
Time-of-Flight Measurements of Single
Time-of-Flight Measurements of Single

... Such direct velocity measurements have been difficult with electron wave packets because gate pulses would also affect the background Fermi sea. Previous experiments [14, 23, 24] use other types of electron-transport data to estimate the electron velocity. Furthermore, electron-electron interactions ...
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ATOMIC SPECTRA Theory

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FTIR Instrumentation
FTIR Instrumentation

... Chemical infrared spectroscopy emerged as a science in the 1880s. In the 1890s, A. A. Michelson, to further his studies of the speed of light, invented the interferometer. In the early 1940s, chemical infrared spectroscopy was still an immature scientific field. But with commercial development of th ...
BASIC CHEMISTRY
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Chapter 7 - Quantum Numbers, Orbitals, and Electron
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... For the H atom the orbital energy depends only on n, so all orbitals with the same value of n have the same energy. This is not true, however, for any other atom! The H atom orbitals may be used to approximate the orbitals for multi-electron atoms. But since these atoms have more than one electron, ...
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Analysis of the famous experiment of Grangier, Roger, and Aspect

... enters the interferometer. This is done by generating two photons at the same time (“twin” photons), one of which is channeled to the alarm detector (where it is destroyed uppon triggering the alarm), and the other to the input of the interferometer. GRA and Thorn, et al., generate the twins in diff ...
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Chemistry 112 Final Exam (Non comprehensive part)

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Physics 1C - University of California, San Diego
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EXPERIMENT Q-5 Electron Diffraction Abstract References Pre-Lab
EXPERIMENT Q-5 Electron Diffraction Abstract References Pre-Lab

... of electrons is "diffracted" by a crystalline sample according to the "Bragg law", an equation originally used to describe X-ray diffraction. The beam of electrons with common speed v is produced by an "electron gun". The electron gun consists of two parallel metal plates, the cathode and the anode, ...
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Miss Pang`s 2012 Review

... 31. Alkali metals form Family-I of the periodic table of elements. In increasing order of mass, they include lithium, sodium, potassium, rubidium, cesium, and francium. These six elements are grouped in the same family by reason of the similarity of their chemical properties. Which of the following ...
6.1 Electromagnetic Waves
6.1 Electromagnetic Waves

... a harmonic wave in either time or distance • waves are characterized by their period, frequency, wavelength and wave number • Planck's Law gives the energy of electromagnetic quanta • ν and λ are related by the speed of light, which in turn is determined by the refractive index • electromagnetic rad ...
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... The  beam  of  electrons  is  incident  on  the  double-­‐slit,  and  each  slit  acts  as  a  coherent   wave  source.    The  waves  interfere  in  the  regions  of  overlap,  and  we  see  at  the   detec,ng  screen  a  brightn ...
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Honors Chemistry

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Chapter Six: The Structure of the atoms
Chapter Six: The Structure of the atoms

... When the light from a discharge tube containing a pure element (hydrogen in this case) is passed through the same prism, only certain colors (lines) are observed. Recall that color (wavelength) is related to energy via Planck’s law. ...
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X-ray fluorescence



X-ray fluorescence (XRF) is the emission of characteristic ""secondary"" (or fluorescent) X-rays from a material that has been excited by bombarding with high-energy X-rays or gamma rays. The phenomenon is widely used for elemental analysis and chemical analysis, particularly in the investigation of metals, glass, ceramics and building materials, and for research in geochemistry, forensic science and archaeology.
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