# Electron Momentum

1. Nov 17, 2009

### Dinno

1. The problem statement, all variables and given/known data

Find the uncertainty in the momentum(in kg x m/s) of an electron if the uncertainty in its position is equal to 3.4x10-10m, the circumference of the first Bohr Orbit.

2. Relevant equations

n$$\lambda$$=2r

$$\lambda$$= h/mv

mvr= nh/2$$\pi$$

3. The attempt at a solution

3.4x10-10=2 pi r
r= 5.41x10-11m

$$\lambda$$=h/mv
v=2.141x106m/s

mvr=nh/2 pi
m=7.278x10-4J/m2
--But this answer is not in kg x m/s!

Last edited: Nov 17, 2009
2. Nov 17, 2009

### turin

You have the wrong relevant equations. Hint: you only need one. Another hint: the problem is almost certainly asking for the minimum uncertainty in momentum.