Griffiths Intro Quantum Mechanics free particle question.
Normalize wave function, find Phi(k), Psi(x,t), and comment on its behavior for small and large a.
The wave function given is Ae-a|x|
The Attempt at a Solution
I found the correct Phi(k), but for the small a vs large a, I don't understand why Phi(k) corresponds to momentum. I see that there is a small spread with a sharper peak in Psi with a flatter, more spread out Phi, and a flatter more spread out Psi with a sharper, smaller spread Phi, but I don't see how this is an example of the uncertainty principle. I don't see from reading Griffiths how Phi is any indication of momentum.[/B]