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Homework Help: Potential Difference in and Electron/de Broglie Equation

  1. Mar 13, 2009 #1
    1. The problem statement, all variables and given/known data

    Through what potential difference should you accelerate an electron from rest, such that it's de Broglie wavelength will be 0.1 nm.

    2. Relevant equations

    E = hf
    λf = c

    3. The attempt at a solution

    My Thinking was;

    E = hf
    E = hλ/c
    E= 6.626e-34 * 1e-10/3e8

    which turned out 2.21e-58 J, which I'm pretty sure is wrong.

    Anyone with some ideas or a worked solution would be fantastic :D

    Regards all,

  2. jcsd
  3. Mar 13, 2009 #2
    You're right so far, though you should re-check your final calculation, since you're off by a couple orders of 10. So now you need to figure out what voltage difference is going to supply the energy you calculated. I would recommend converting the energy you calculate into electron volts, since those will make the voltage calculation easier.
  4. Mar 13, 2009 #3
    Solved, 150V, thanks jd :)

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