From the Millikan Oil Drop Experiment, every oil drop contained an integer of electrons. Every oil drop had different masses, but the ratio of the charge of electrons is constant. It was then determined that the drop will contain a whole number of electrons.
Learning Goal: To analyze the experiment used to determine the properties of an electron.
In 1909, Robert Millikan performed an experiment involving tiny, charged drops of oil. The drops were charged because they had picked up extra electrons. Millikan was able to measure the charge on each drop in coulombs. Here is an example of what his data may have looked like.
Why did different drops have different charges?
a) Because the drops were different sizes.
b) Because some drops contained more atoms than others.
c) Because some drops had picked up more electrons than others.
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