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Group velocity of a wave

  1. Jan 21, 2017 #1
    1. The problem statement, all variables and given/known data
    The group velocity of a wave is given by the equation
    Vg = dv/d(1/λ)
    Prove that the group velocity of a de Broglie particle wave is equal to the ordinary velocity of the particle. Assume the potential energy is equal to zero

    2. Relevant equations

    3. The attempt at a solution
    I don't know how to start this. None of this was covered in lecture. Any help would be greatly appreciated
  2. jcsd
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