# Simultaneous measurement of the momentum component px

1. Apr 29, 2015

### jdawg

1. The problem statement, all variables and given/known data
The uncertainty in the position of an electron along an x axis is given as 38 pm. What is the least uncertainty in any simultaneous measurement of the momentum component px of this electron?

2. Relevant equations
Position uncertainty = h/ delta p (delta p is the uncertainty in the momentum)
Delta p = (percentage of speed)*Px

3. The attempt at a solution
I got the momentum uncetainty to be 1.74*10^-23

2. Apr 30, 2015

### BvU

You use $\Delta p \Delta x = h$. From what I remember, there is a more strict relationship that may well be the one they want you to use here...

3. Apr 30, 2015

Thank you!