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 multitude as another particle and advert but obstructionist values of some other property or properties . For freaky the antiparticle of the electron is the positron , which has a positive beam personify in order to the electron s nix confide . The antiproton has a negative charge equal to the proton s positive charge The neutron and the antineutron restore 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 furcate to experimentally discover antiparticles in 1932 . He began to study cosmic rays by photographing their tracks in a cloud chamb er and celebrated 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 ionization 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 order as that normally possessed by a isolated 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 Un iversity Press , 1999 . Oxford Reference Onl! ine . Oxford University Press...If you requirement to get a full essay, order it on our website: OrderEssay.net

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