# Homework Help: Problem relating to the Heisenberg's Principle

1. Mar 25, 2010

### uzair_ha91

1. The problem statement, all variables and given/known data
An electron is placed in a box about the size of an atom that is about 1*10^-10m. What is the velocity of the electron?

2. Relevant equations
Heisenberg's equation
xp=h/2pi
xmv=h/2pi
v=h/2pi*x*m
where x=1*10^-10m
m=9.1*10^-31kg
h=planck's cosntant

3. The attempt at a solution

2. Mar 25, 2010

### willem2

$$\Delta x \Delta p \geq \frac {h} { 4 \pi}$$

NOT

$$x p = \frac {h} { 4 \pi}$$

(I don't know how to do the reduced planck's constant in Latex)

3. Mar 27, 2010

### uzair_ha91

So it's 4pi not 2pi? Actually the answer I'm getting is different from that which is given at the end of my physics book.
And while solving the problem, doesn't it become $$\Delta$$x$$\Delta$$p=h/4pi?