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 plenty as another particle and advert but opposer values of some other property or properties . For eccentric the antiparticle of the electron is the positron , which has a positive beam equal in order to the electron s negative charge . The antiproton has a negative charge equal to the proton s positive charge The neutron and the antineutron prepare magnetic moments opposite in sign relative to their spins antiparticle A Dictionary of Physics . Ed . John Daintith . Oxford University Press , 2000Carl David Anderson was the branch to experimentally discover antiparticles in 1932 . He began to study cosmic rays by photographing their tracks in a cloud chamber and far-famed 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 known at the time ) as they did not produce sufficient ionisation in the chamber . Eventually Anderson concluded that such results could logically be interpreted only in terms of particles of a positive charge and a mass of the same of magnitude as that normally possessed by a uninvolved negative electron . It was in fact the positron or positive electron , whose existence he announced in September 1932 Anderson , Carl David A Dictionary of Scientists . Oxford University Press , 1999 . Oxford Reference Online . Oxford University Press...If you requisite to get a full essay, order it on our website: Orderessay

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