How Does Electron Beam Momentum Relate to Molecular Structure Resolution?

[Spam88]

I'm just looking at some Quantum and Atomic Physics exam papers, and I've come across a question I can't do. It's probably simple but I'm just not seeing it.

Estimate the minimum momentum necessary for a beam of electrons to probe any
possible structure within a molecule whose dimension is no greater than 100 nm
(100 × 10−9 m).

Thanks :)

 

[mgb_phys]

Electrons have a wavelength - if the wavelength is larger than the feature you aren't going to see it.