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Homework Help: Temperature relevance of the Franck-Hertz Experiment

  1. Aug 8, 2009 #1
    I have to do a lab next week in which I repeat the Franck-Hertz experiment. I am reasonably sure that I understand most of what I need to do, but I'm just a little unsure on a couple of points, and would appreciate some guidance if anyone is knowledgeable with it.

    The instructions say that the tube must be heated to ~180°C. I assume that this is to vapourise the mercury, and get it to a suitable pressure? Is there any other reason? I was looking online for an answer, and a lot of the pages said that the tube should under no circumstances be heated above 205°C. Is there any specific reason for this?

    I may have further questions as my research continues. Any help on this would be greatly appreciated.
  2. jcsd
  3. Aug 9, 2009 #2


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