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CHM 312
CHM 312

Wire Chamber
Wire Chamber

... Transport of Electrons in Gases: Diffusion An initially point like cloud of electrons will ‘diffuse’ because of multiple collisions and assume a Gaussian shape. The diffusion depends on the average energy of the electrons. The variance σ2 of the distribution grows linearly with time. In case of an ...
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Charge sensing in intrinsic silicon quantum dots
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High School Advanced Physics Curriculum Essentials

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TOPIC 7. CHEMICAL CALCULATIONS I

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4.1 Describing Motion How do we describe motion?

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CHAP3

Problem 5. The Second Law of thermodynamics
Problem 5. The Second Law of thermodynamics

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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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