1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quantum - potential difference problem.

  1. Jan 14, 2006 #1
    question:

    A certain proton needs to have a lamba of 0.0055 x 10^-9m. What potential difference must this proton be accelerated to achieve this wavelength?

    what i know:

    im assuming that what we need to find in this question is the amount of kinetic enegry needed to achieve such a lambda.

    E = hv / y y will represent lambda
    i also know that
    Ek = eV <--- potential difference
    and that
    Ek = 1/2mv^2

    so eV = 1/2mv^2
    and v is = E x lambda / h

    so

    eV = 1/2m (eV x lamba / h) ^2

    am i on the right track here or am i completly lost??
     
  2. jcsd
  3. Jan 14, 2006 #2

    Astronuc

    User Avatar

    Staff: Mentor

    It depends on whether or not the proton is relativistic.

    You are looking for the potential which will impart a kinetic energy to a proton such the wavelength is as given.

    See - http://hyperphysics.phy-astr.gsu.edu/hbase/debrog.html#c3

    You might try the relativistic and non-relativistic formulae to see the difference.
     
  4. Jan 15, 2006 #3
    hmmm, will do.

    thanks for the help
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Quantum - potential difference problem.
  1. Quantum problem (Replies: 5)

Loading...