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Homework Help: Electron Momentum

  1. Nov 17, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the uncertainty in the momentum(in kg x m/s) of an electron if the uncertainty in its position is equal to 3.4x10-10m, the circumference of the first Bohr Orbit.

    2. Relevant equations

    n[tex]\lambda[/tex]=2r

    [tex]\lambda[/tex]= h/mv

    mvr= nh/2[tex]\pi[/tex]

    3. The attempt at a solution

    3.4x10-10=2 pi r
    r= 5.41x10-11m

    [tex]\lambda[/tex]=h/mv
    v=2.141x106m/s

    mvr=nh/2 pi
    m=7.278x10-4J/m2
    --But this answer is not in kg x m/s!
     
    Last edited: Nov 17, 2009
  2. jcsd
  3. Nov 17, 2009 #2

    turin

    User Avatar
    Homework Helper

    You have the wrong relevant equations. Hint: you only need one. Another hint: the problem is almost certainly asking for the minimum uncertainty in momentum.
     
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