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Faculty of Natural Sciences
Faculty of Natural Sciences

... Crystal structures, Bravais lattices: basis, unit cell, reciprocal lattice, packing faction. Theory of diffraction: structural factor, atomic scattering factor. Noncrystalline solids, liquid crystals. Real crystals, classification of defects, thermodynamics of point defects. Lattice vibrations in ha ...
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Nonlinear THz response of a one-dimensional superlattice * Avik W. Ghosh

... zeroth order Bessel function, the electron is predicted to execute bounded ac Bloch oscillations, else it drifts off. This behavior is easily understood in terms of a simple semiclassical picture;10 the electron continues to execute ac Bloch oscillations in phase with the incident field if it manage ...
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Press here to hemy 102 lab manual

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Einstein`s impact on the physics of the twentieth century

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Chapter 3 2014
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... transferred to the entire WC, similar to the Mössbauer effect. This can be contrasted with the case of an electron confined inside the well but not under the barrier. Here the magnetic barrier is reduced by a factor of 2 compared to the free-electron case, but does not disappear [6]. We now apply th ...
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Stoichiometry - Mr Field's Chemistry Class

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... model for the combustion of gasoline. The use of octane to represent all of the hydrocarbons in gasoline is mainly for simplicity. If we chose to, it would not be very difficult to write similar combustion equations for each hydrocarbon that is actually present. But the assumption of complete combus ...
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... Atomic units (AU) form a unit system which aims to simplify the equations describing atomic processes on their respective time-, length- or energy scale. At the same time they give a feeling for how the characteristics that are considered relate to atomic scales. They allow to assess if a process is ...
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MCQ For XI - auroraclasses.org

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Atomic theory



In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms.The word atom comes from the Ancient Greek adjective atomos, meaning ""uncuttable"". 19th century chemists began using the term in connection with the growing number of irreducible chemical elements. While seemingly apropos, around the turn of the 20th century, through various experiments with electromagnetism and radioactivity, physicists discovered that the so-called ""uncuttable atom"" was actually a conglomerate of various subatomic particles (chiefly, electrons, protons and neutrons) which can exist separately from each other. In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all. Since atoms were found to be divisible, physicists later invented the term ""elementary particles"" to describe the ""uncuttable"", though not indestructible, parts of an atom. The field of science which studies subatomic particles is particle physics, and it is in this field that physicists hope to discover the true fundamental nature of matter.
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