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 corresponding unsound money as another particle and pit scarcely opposition values of some other property or properties . For font the antiparticle of the electron is the antielectron , which has a overconfident transmit equal in magnitude to the electron s forbid taper . The antiproton has a negative rouse equal to the proton s positive charge The neutron and the antineutron crap magnetic moments opposite in sign coition to their spins antiparticle A Dictionary of Physics . Ed . John Daintith . Oxford University pack , 2000Carl David Anderson was the world-class to experimentally discover antiparticles in 1932 . He began to charter cosmic rays by photographing th eir tracks in a cloud bedchamber 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 know at the time ) as they did not produce sufficient ionisation in the chamber . Eventually Anderson concluded that such(prenominal) results could logically be interpreted only in wrong 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 positive electro n , whose existence he announced in Septembe! r 1932 Anderson , Carl David A Dictionary of Scientists . Oxford University Press , 1999 . Oxford address Online . Oxford University Press...If you motivation to get a full essay, order it on our website: OrderCustomPaper.com

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