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Homework Help: Uncertainty momentum position velocity

  1. Jun 3, 2009 #1
    1. The problem statement, all variables and given/known data

    I have a dilemma. My problem states that an electron that is in position 2.34 nm along the x axis, travels along the x axis with a certain speed (A) and a with the uncertainty in the velocity (B). I am asked to calculate the minimum uncertainty in the position.

    2. Relevant equations

    I know

    delta(x)*delta(P)>= hbar/2
    delta(P)= delta(v)*(mass electron)

    for delta(v) i'm going to use the B

    3. The attempt at a solution

    I have done this

    delta (x) = (hbar)/2*(delta(v))*(mass electron)

    my question is, i don't need the position and the velocity then
  2. jcsd
  3. Jun 3, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Careful with parentheses--it's hard to tell if you are multiplying or dividing by delta(P).

    That's right--you don't need that information.
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