Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    ΔpΔx>h/4Pi
    p=mv
    Δx=2nλ

    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

    turin

    User Avatar
    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.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook