1. The problem statement, all variables and given/known data, 2. Relevant equations, 3. The attempt at a solution: If an electron and photon have the same energy, the electron will have a shorter wavelength, and a larger momentum. The shorter wavelength makes it useful for electron microscopes, outperforming optical microscopes because optical microscopes use light with wavelengths in the visible light range (cant see things as small with optical). My question is, what is the significance of the larger momentum of the electron for microscopes? And what is the significance of the larger momentum of the electron for other applications? I can't find this info anywhere. And one last question, why can't there be a microscope that uses wavelengths of light that are not in the visible light range? Like, if an electron microscope uses a plate to imprint the image, why cant a light microscope, then you will not need to view it with your eye.. Is this where the significance of electron momentum comes into play?? Thanks.