How Does Electron Beam Momentum Relate to Molecular Structure Resolution?

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Spam88
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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 :)
 

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