Final answer:
The Milkman oil-drop experiment is a physics experiment that allowed Robert Millikan to determine the charge of a single electron. By spraying a fine mist of oil droplets between two charged plates and adjusting the electric charge, the charge on the oil drops can be determined.
Step-by-step explanation:
The Milkman oil-drop experiment is a physics experiment that was conducted by Robert Millikan between 1908 and 1917. The experiment allowed Millikan to determine the charge of a single electron. In the experiment, a fine mist of oil droplets is sprayed between two metal plates that are charged with opposite charges. By knowing the mass of the oil droplets and adjusting the electric charge on the plates, the charge on the oil drops can be determined with precision.