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Gas in cathode-ray experiment?

  1. Feb 18, 2007 #1
    Which gas is used in cathode ray experiment by J.J. Thomson & Sir William?

    The voltage they used was about: 15k-20k V
    The pressure they used: < 0.1mm of Hg
    The gas they used: ?
     
  2. jcsd
  3. Feb 18, 2007 #2

    Astronuc

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    Staff: Mentor

    Apparently different gases were tried in cathode ray tubes at the time.

    However based on the fact that Thompson used an evacuated tube (0.1 mmHg vs 1 atmosphere or 760 mmHg), the I would expect the gas was air.

    http://www.aip.org/history/electron/jj1897.htm
     
  4. Mar 3, 2007 #3
    What a coincidence, I'm on that site too searching for a brief outline of the debate on whether cathode rays are waves or particles (both are correct) and the properties which they exhibit categorized them as either waves or particles.
     
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