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Derive cyclotron and synchrotron frequency

  1. Nov 14, 2012 #1
    I am trying to find out how to derive the cyclotron and synchrotron frequency, but everywhere I look it is derived by saying that the force of the magnetic field is not qvB, but (v/c)qB. What on earth is this c? Im guessing it means speed of light but then it is not the case that (v/c)qB = (mv^2)/r....but that is what is says everywhere for this derivation. I have attached a snapshot of a website deriving it this way as an example.
     

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  2. jcsd
  3. Nov 14, 2012 #2
    It's a matter of units.
    The formula with c in it is the expression of Lorentz force in CGS units.
    The one that you are more familiar with is in SI units.
     
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