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Heisenberg Uncertainty Principle - h/(4.Phi) versus h/(2.Phi)

  1. Mar 3, 2005 #1
    Heisenberg Uncertainty Principle - h/(4.Pi) versus h/(2.Pi)

    What's the reason behind the factor 2 in the way some books/papers present Heisenberg Uncertainty Principle?
    h/(4.Pi) versus h/(2.Pi)
    When in history did this discrepancy arise and who was responsible for that?
    Ultimately, which figure should we use when we are solving HUP problems?
    Last edited: Mar 4, 2005
  2. jcsd
  3. Mar 3, 2005 #2
    I think you mean [itex]h/4\pi[/itex] and [itex]h/2\pi[/itex]. I would refer you to http://en.wikipedia.org/wiki/Uncertainty_principle which provides an excellent description of the general uncertainty principle and also explains why the two reults are often quoted. The more correct one is [itex]h/4\pi[/itex].
  4. Mar 7, 2005 #3


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    The correct one is with [tex] \frac{\hbar}{2} [/tex] as it can be shown starting with the general uncertainty relations.

    Any other constant is incorrect.

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