Question

How did Millikan's oil drop experiment increase our understanding of sub-atomic particles?

Answer 1

Millikan's oil drop experiment QUANTIFIED the electronic charge...

Explanation:

Millikan's experiment was a triumph of data collection, and experimental design...but it really did not add too much to theory. Before Millikan's time, the mass to charge ratio of the electron was known, due to experimental measurement by another prodigiously talented experimenter, J. J. Thomson...

I have written this before, but if these early researchers had a bit of foresight, they would have designated the electronic charge as POSITIVE, and the nuclear charge as negative....