Uncertainty momentum position velocity

[jackxxny]

Homework Statement

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.

Homework 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

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

 

[Doc Al]

I have done this

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

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

my question is, i don't need the position and the velocity then

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