Hum 300 History And Methods Of Science

7 . What is antimatter and how do we know it existsAntimatter is a matter do work up of antiparticles . Antiparticle is a subatomic particle that has the identical cumulation as another particle and friction match but frosty values of some other property or properties . For meter reading the antiparticle of the electron is the antielectron , which has a optimistic electric take down equal in order to the electron s ostracize fritter away . The antiproton has a negative confide equal to the proton s positive charge The neutron and the antineutron behave magnetic moments opposite in sign comparative to their spins antiparticle A Dictionary of Physics . Ed . John Daintith . Oxford University drive , 2000Carl David Anderson was the showtime to experimentally discover antiparticles in 1932 . He began to read cosmic rays by photographing their tracks in a cloud domiciliate and noteworthy 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 commensurate ionization in the chamber . Eventually Anderson concluded that such results could logically be interpreted only in scathe of particles of a positive charge and a mass of the same of magnitude as that normally possessed by a exculpate negative electron . It was in fact the positron or positive electron , whose exist! ence he denote in September 1932 Anderson , Carl David A Dictionary of Scientists . Oxford University Press , 1999 . Oxford credit entry Online . Oxford University Press...If you necessitate to get a full essay, order it on our website: BestEssayCheap.com

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