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Calculate the kinetic energy of an electron with a wavelength of 1fm

  1. Jan 20, 2013 #1
    1. The problem statement, all variables and given/known data

    Calculate the kinetic energy of an electron with a wavelength of 1fm

    2. Relevant equations

    DeBroglie's relation
    [tex]E^2=(pc)^2+\left(mc^2\right)^2[/tex]

    3. The attempt at a solution

    I used debroglies relation to find momentum. plugged that in to find E, and then subtracted the rest mass to find the kinetic energy. Is this even right? Is there a better way to do it?
     
  2. jcsd
  3. Jan 21, 2013 #2
    I agree with your method.

    In this case the energy is so much greater than rest energy that
    [tex]E≈pc[/tex]
    is a good approximation of the answer.
     
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