Infinite potential well

[Feynmanfan]

At t=0 an electron in an infinite potential well has a wave function corresponding to the lowest level of energy. The wave function is equal to the eigenfunction of the Hamiltonian where n=1.

I am asked to calculate the uncertainty of the electron's momentum. I don't really know where to start from.

Thanks for your advice

 

[dextercioby]

How about the definition of the uncertainty...?

Daniel.