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Drift Velocity ambiguity in relation

  1. Jul 31, 2012 #1
    How is it possible that the two relations i.e.,
    v=(eE/m)t
    and
    v=(eE/2m)t
    both holds good?
    where e is the elementary charge, m is the mass of the elementary particle, E is the electric field, v is the drift velocity and t is the relaxation time.
     
  2. jcsd
  3. Jul 31, 2012 #2

    mfb

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    Staff: Mentor

    Where do you get these relations?
    Maybe they refer to different situations. The first one looks like a uniform acceleration in an electric field, with 0 initial velocity.
    The second one might come from a situation where the initial and final velocity have the same magnitude (butopposite direction). Note that the velocity difference is then twice this value, and therefore identical to the first setup.
     
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