(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Hi, i have this problem:

In a 3D space, a free particle is described by :

$$ \Psi = Ne^{-ar} $$ with $$ r=| \vec r | $$

at the time t=0 .

How can we write the wave function whit $$ \hbar \vec k $$ ?

2. Relevant equations

3. The attempt at a solution

I know how to resolve this exercise in 1D but here i have to calculate a Fourier Transform in a 3D space, how can i do ?

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# Homework Help: QM: free particle

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