Electron Momentum Uncertainty Calculation

[Dinno]

Homework Statement

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.

Homework Equations

n\lambda=2r

\lambda= h/mv

mvr= nh/2\pi

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!

 

[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.