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Electron and linear potential

  1. Mar 30, 2008 #1
    For my current assignment we are investigating an electron incident on a linear potential. For the most part i am happy with my answers, however i am having trouble answering one question - how would one create a linear potential experimentally?

    I know linear potentials exist in diodes, but i believe a vacuum would be required to investigate the incoming electron for the present problem?
  2. jcsd
  3. Mar 30, 2008 #2


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    Staff: Mentor

    Do you mean a V(x) that is linear in x, i.e. V(x) = ax + b where a and b are constants? The space between two parallel plates that are at different potentials has a linear potential function.
  4. Mar 30, 2008 #3

    From a person that is a beginner in physics but wishes to know.
    according to the theory of big bang the universe was made by
    a point of energy that exploted, but isnt this going against
    the law of conservation of momentum which says that there
    have to be a source of matter a nucleous that will absorb
    both the energy and momentum?
  5. Mar 30, 2008 #4
    Thanks for the reply jtbell, yes, i do mean "a V(x) that is linear in x, i.e. V(x) = ax + b where a and b are constants?"

    In order to investigate quantum mechanical tunneling of this electron is it possible to have an electron emmitted from one plate to the other with the plates in a vacuum? You see, while the potential is linear between said plates, i am investigating an electron incident such that it sees the potential as V(x)=ax, not incident perpindicular to the potential.
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