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Problem For Structure of Nuclei - Enigmatic !

  1. Dec 10, 2009 #1
    Problem For Structure of Nuclei -- Enigmatic !

    Question :- calculate the distance of closest apprach for a head on collision between 5.30Mev alpha particle and nucleus of a copper atom?

    Answer
    The distance of closest
    approach is given by

    d= _______qQ_______
    4*pie*e0*K base alpha

    = ____________2*29*(1.60*10^-19C)^2_______
    4*3.142*8.85*10^-12C^2/Nm^2*5.30MeV*1.60*10^-13J/MeV

    = 1.4 * 10^ -6 aNSWER..........

    NOW I AM CONFUSED HERE ABOUT ONE THING AND ITS EATING ME ALIVE.....FROM WHERE DID 1.60*10^-13J/MeV CAME ? I HAVE USED COLUMB'S LAW !
     
  2. jcsd
  3. Dec 10, 2009 #2

    Hepth

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    Gold Member

    Re: Problem For Structure of Nuclei -- Enigmatic !

    its the conversion between MeV and joules. Both are energy units.
     
  4. Dec 10, 2009 #3

    bcrowell

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    Gold Member

    Re: Problem For Structure of Nuclei -- Enigmatic !

    It's the fundamental charge, e, expressed in unusual units.
     
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