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Franck Hertz questions

  1. Sep 16, 2004 #1
    I am reading about the Franck Hertz experiment from a text and have some questions about it since I am quite confused...

    How do electrons interact with mercury and helium atoms? I hope this is not too stupid a question for you guys...

    What has to be the energy of the electron so that the atom can be excited upon colliding with it? (How do you know this?)

    How would their result depend on the mean free path of the electron in helium or mercury vapour? The book mentioned a bit about this but I think that I still need some clarification.

    What does this mean free path depend on?

    I am very curious about these things...hopefully knowing these answers will provide me with a clear idea in my head.

  2. jcsd
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