# Quantum physics potential well.

1. Jun 30, 2013

### arierreF

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

In the instant t=0, we have the following wave function of a particle in a infinite potential well with a width $a$.

$\psi (x) = \sqrt{\frac{2}{a}}\text{Sin}\left[\frac{n*\text{Pi}*x}{a}\right]$

Calculate the momentum space wave function.

Ok, i just want to confirm if i have to use the following equation to calculate momentum space wave function:

$\phi (p) = \sqrt{\frac{1}{2*\text{Pi}*\hbar}}\int _0^ae^{-i*p*x/\hbar}dx\sqrt{\frac{2}{a}}\text{Sin}\left[\frac{n*\text{Pi}*x}{a}\right]$

Considering that the well has a zero potential between 0 and a.

Last edited: Jun 30, 2013
2. Jun 30, 2013

### vela

Staff Emeritus
Right. The momentum-space wave function is simply the Fourier transform.

3. Jun 30, 2013

ok thanks !