cathode - Note-A-Rific: Cathode Rays A lot of the original...

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Note-A-Rific: Cathode Rays A lot of the original investigations into electrons and protons started with cathode ray tubes. Basically, a modern day television picture tube is a cathode ray tube with a few added gimmicks. The tube is nearly a vacuum, with two electrodes inside. If there is a high enough voltage between the two, it appeared as if something was being thrown off the electrode called the cathode. They called these cathode rays, but today we know that they were really just a bunch of electrons. J.J. Thompson set up his cathode ray tube so that he was able to change the direction of electrons flying through it. Take a look at the diagram at the bottom of page 706. First he used a set of parallel plates to create a uniform electric field that the electrons flew through. o This caused a force on the charges that can be calculated using… E = F e /q ! F e = Eq o The tube was set up so that the electrons were pushed up by this force. He also set up two coils with a current flowing through them to induce a
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This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

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cathode - Note-A-Rific: Cathode Rays A lot of the original...

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