Cathode Rays Lead to Thomson's Model of the Atom
In the mid 1800's scientists successfully passed an electric current through a vacuum in a glass tube. They saw a glow from the tube that seemed to emanate from the negatively charged plate...
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so today and i'm at the University of Sydney with Doctor Phil Dooley and we're talking abouthow our idea of the atom changed from a tiny little hard sphereto something more complicatedAnd this apparatus has something to do with that Phil: exactly, exactly it was quite athe landmark historicalexperimentit's just made of a tube of glass connected to aa vacuum pumpand in the tube of glass there are two pieces of metal connected to high-voltage power supplyso we can suck the air out of here Phil: that's rightand then apply a high voltage two metal plates Phil: yesNormally withhigh voltage in air we don't get anything except maybe a big sparkbut what we what Geissler found who did this in 1857was something quite different so shall we h...
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so today and i'm at the University of Sydney with Doctor Phil Dooley and we're talking abouthow our idea of the atom changed from a tiny little hard sphereto something more complicatedAnd this apparatus has something to do with that Phil: exactly, exactly it was quite athe landmark historicalexperimentit's just made of a tube of glass connected to aa vacuum pumpand in the tube of glass there are two pieces of metal connected to high-voltage power supplyso we can suck the air out of here Phil: that's rightand then apply a high voltage two metal plates Phil: yesNormally withhigh voltage in air we don't get anything except maybe a big sparkbut what we what Geissler found who did this in 1857was something quite different so shall we h...
