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Homework Help: Mass Spectrometer Formula question

  1. Feb 24, 2012 #1
    1. The problem statement, all variables and given/known data
    In the velocity selector region of a mass spectrometer, an electric field of
    2.34 × 10^3 N/C is perpendicular to a magnetic field, B = 1.56 × 10^-2 T.
    Abeam of positive ions (q = +e) then enters a region with the same B field,
    but no E field. If the ions are detected at a radius of curvature of r = 1.20m,
    what is the mass of the unknown ion?

    2. Relevant equations

    3. The attempt at a solution
    Got the answer m=1.99x10^-26, or 12u

    The question asks for the mass of the ion, it is my understanding that the formula I used solves for the mass of the atom, not an ion. I'm not sure if the question should be asking for the mass of the unknown atom or I am not using the correct formula, in which case how do I solve the mass of the ion?

  2. jcsd
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