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Homework Help: Print ViewSimultaneous Measurements of Position and Velocity

  1. Nov 22, 2008 #1
    1. The problem statement, all variables and given/known data

    The x coordinate of an electron is measured with an uncertainty of 0.200 mm. What is v_x, the x component of the electron's velocity, if the minimum percentage uncertainty in a simultaneous measurement of v_x is 1.00 %? Use the following expression for the uncertainty principle:

    (Delta x * Delta p_x )> or = h/2pi,

    where Delta x is the uncertainty in the x coordinate of a particle, Delta p_x is the particle's uncertainty in the x component of momentum, and where h is Planck's constant.

    My attempt:

    delta p_x = h/(2pi*delta x)

    delta p_x=m* delta v_x ??

    i dnt know if i am allowed to do this.. also if it is allowed i dont know what to do next..
    Last edited: Nov 22, 2008
  2. jcsd
  3. Nov 22, 2008 #2
    So far so good! Now the other thing you have been given is that delta v_x is 1% of v_x.
  4. Nov 22, 2008 #3
    Ok im gonna try it
    Thanks a lot!
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