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Speed of electron in a plane

  1. Oct 8, 2009 #1
    1. The problem statement, all variables and given/known data

    An electron with kinetic energy 1.92 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 26.0 cm.
    Find the speed of the electron.

    Find the magnetic field.

    Find the frequency of circling. (Hz)

    Find the period of the motion.


    2. Relevant equations
    v=sqrt(2*(3.7E-16J/9.109E-31)
    k=(mv)^2/2
    B-mvqr

    3. The attempt at a solution
    for velocity i get 2.85E-23 m/s ...but it is wrong...i do not know what to do
     
  2. jcsd
  3. Oct 8, 2009 #2
    try computing sqrt(2*(3.7E-16J/9.109E-31)) again
     
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