what is the difference between a hole and a positron?
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From http://en.wikipedia.org/wiki/Electron_hole "The concept describes the lack of an electron at a position where one could exist in an atom or atomic lattice. It is different from the positron, which is an actual particle of antimatter, whereas the hole is just a fiction, used for modeling convenience."
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As nouns the difference between vacancy and hole is that vacancy is an unoccupied position or job while hole is a hollow place or cavity; an excavation; a pit; an opening in or through a solid body, a fabric, etc; a perforation; a rent; a fissure.
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While CT and MRI scans show images of your body's internal organs and tissues, PET scans can give your healthcare provider a view of complex systemic diseases by showing problems at the cellular level. Unlike MRIs, PET scans use positrons.
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A beta has a negative charge such that the new isotope has one less neutron and one more proton than the original isotope. A positron has a positive charge such that the new isotope has one more neutron and one less proton than the original isotope.
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The nucleus makes up a tiny proportion of the space occupied by an atom, while the electrons make up the rest. According to quantum electrodynamics, the space is filled by an electron field around the nucleus which neutralizes its charge and fills the space defining the atom size.
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Xenon has larger radii; therefore the electron attraction to the nucleus is weaker in comparison to the smaller noble gases. Fluorine on the other hand is very tiny and highly electronegative, so it would steal an electron from fluorine, forming acompound.
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2.1 INTRODUCTION. The beta particle has the same mass and charge as an electron. It differs from the electron in its origin. The beta particle, which may be either negatively charged (negatrons) or positively charged (positrons), originates from the nucleus of an atom.
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The EEPROM uses the principle same as that of the UV-EPROM. ... In EPROM , cell is erased when electrons are removed from the floating gate, whereas in EEPROM , cell is erased when electrons are trapped in the floating cell. There are two distinct EEPROM families: serial and parallel access.
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Positron Emissie Tomografie (PET-scan) Vervolgens wordt er een scan gemaakt. De radioactieve stof die u krijgt toegediend, is niet gevaarlijk en verdwijnt binnen enkele uren weer uit het lichaam.
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A hole in a wall is usually thought of as a gap through it from one side to the other. A cavity is an empty space enclosed within a solid, but open on one surface.
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Alpha particles are energetic (fast) helium nuclei, beta particles are smaller and have half the charge, being energetic electrons (or positrons) only the gamma particles are photons, i.e., they are not massive particles at all, they are a form of electromagnetic radiation, a form more energetic than X-rays.
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As nouns the difference between hole and trench is that hole is a hollow spot in a surface while trench is a long, narrow ditch or hole dug in the ground, especially in warfare.
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As nouns the difference between space and void is that space is of time while void is an empty space; a vacuum or void can be .
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A positron or antielectron is the antimatter counterpart to an electron. A positron has the equal or same mass as an electron and a spin of 1/2, but it has an electrical charge of +1. When a positron collides with electron annihilation occur which results in the production of two or more gamma ray photons.
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As nouns the difference between hole and tunnel is that hole is a hollow spot in a surface while tunnel is an underground or underwater passage.
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As nouns the difference between hole and bore is that hole is a hollow spot in a surface while bore is a hole drilled or milled through something or bore can be a sudden and rapid flow of tide in certain rivers and estuaries which rolls up as a wave; an eagre.
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The main difference between the two types of transistors is that holes are the more important carriers for PNP transistors, whereas electrons are the important carriers for NPN transistors. Then, PNP transistors use a small base current and a negative base voltage to control a much larger emitter-collector current.