Hum 300 History And Methods Of Science

7 . What is antimatter and how do we know it existsAntimatter is a matter do up of antiparticles . Antiparticle is a subatomic particle that has the same(p) macro money as another particle and pit merely opposition values of some other property or properties . For font the antiparticle of the electron is the antielectron , which has a imperative palpitate equal in magnitude to the electron s forbid find fault . The antiproton has a negative raze equal to the proton s positive charge The neutron and the antineutron crap magnetic moments opposite in sign intercourse to their spins antiparticle A Dictionary of Physics . Ed . John Daintith . Oxford University foment , 2000Carl David Anderson was the world-class to experimentally discover antiparticles in 1932 . He began to necessitate cosmic rays by photographing t heir tracks in a cloud sleeping accommodation and notable that particles of positive charge occurred as abundantly as those of negative charge .

The negative particles were clearly electrons but those of positive charge could not be protons (the only positive particles cognize at the time ) as they did not produce capable ionisation in the chamber . Eventually Anderson concluded that such(prenominal) results could logically be interpreted only in basis of particles of a positive charge and a mass of the same of magnitude as that normally possessed by a salve negative electron . It was in fact the positron or pos itive electron , whose existence he announc! e in September 1932 Anderson , Carl David A Dictionary of Scientists . Oxford University Press , 1999 . Oxford grapheme Online . Oxford University Press...If you motivation to get a full essay, order it on our website: OrderCustomPaper.com

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