 Robert Andrews Millikan

An experimental physicist known for measurements of Electron charge and the photoelectric effect. The Millikan photoelectric experiment describes the apparatus and stopping-voltage measurements behind his 1916 test.^[ref]

Robert Andrews Millikan (1868–1953) was an American experimental physicist who is best known for his groundbreaking work in the field of charged particles and for measuring the elementary charge of an electron. He is particularly famous for his oil drop experiment conducted in 1909, which allowed him to determine the charge of an electron with high precision. Millikan's oil drop experiment involved observing tiny charged oil droplets suspended in an electric field.