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Homework Help: Uncertainty Principle of a nonrelatavistic particle

  1. Mar 12, 2012 #1
    1. The problem statement, all variables and given/known data

    If the uncertainty in the location of a nonrelativistic particle is about equal to twice its de-Broglie wavelength, show that the uncertainty in its velocity is greater than about 4% of its velocity.

    2. Relevant equations


    3. The attempt at a solution

    I've put the above equations together and manipulated them but I'm not really sure how to get to, Δv>0.04v using the above formulae. An indication of where to begin would be greatly appreciated.
  2. jcsd
  3. Mar 13, 2012 #2


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    Homework Helper

    You also have another equation for momentum from Quantum Mechanics.

    What is n?
  4. Mar 13, 2012 #3
    n is an integer. n(lambda)=nh/p. So Lambda = h/p.
    I have it now. Thankyou very much.
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