Question

To what voltages must we accelerate electrons (as in an electron microscope, for example) if we
wish to resolve;
a) a virus of diameter 12 nm , b) an atom of 0.12 nm, c) a proton of diameter 1.2 fm?

Answer 1

The formula you need can be found here:

http://www.ou.edu/research/electron/bmz5364/resolutn.html