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De Broglie Wavelength for 1Mev electron

  1. Nov 16, 2015 #1
    1. The problem statement, all variables and given/known data

    Calculate the de Broglie Wavelength of a 1 MeV electron. Express your answer in femptometers.

    2. Relevant equations

    ## λ = h/p ##
    ## p = (2mT + T^2/c^2)^{1/2} ##

    3. The attempt at a solution

    basically just plugged everything in.

    ## λ = \frac{h}{(2mT + T^2/c^2)^{1/2}} ##

    ## λ = \frac{(4.126*10^{-15}eV*s)}{(2*(0.511*10^6 eV)(10^6 eV) + (10^6 eV)^2/c^2)^{1/2}} ##

    ## λ = 4.09*10^{-21} ##

    Which is way too low. It's supposed to be ##872*10^{-15}##.
     
    Last edited: Nov 16, 2015
  2. jcsd
  3. Nov 16, 2015 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    Watch the units. You entered a mass in units of energy (eV).
     
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