> And if it is 0 or 1?
Nobody seems to have answered this one yet: no you cannot see it. The NAND memory cell will look the very same to you, even under a very strong light-based microscope, regardless if it is 0 or 1. It will look silvery either way. You could measure its state electrically, though. As such, an electron microscope can show you the state because it reacts to the different electric charges.
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