What Did Millikan Discover About the Electron's Charge?

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Millikan conducted two significant experiments: one to measure the charge of the electron and another to verify Einstein's work on the photoelectric effect, which also led to the measurement of Planck's constant. His experiment determined the charge of the electron to be approximately 1.602 x 10^-19 coulombs. The discussion also touches on how to find multiples of this charge. Understanding these concepts is crucial for grasping fundamental principles in physics. Millikan's work remains foundational in the study of atomic and subatomic particles.
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What was his experiment and what did he find?
 
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Millikan did two famous experiments. One measured the charge on the electron. The other verified Einstein's theoretical work on the photoelectric effect, and in doing so, measured Planck's constant.
 
The charged electron is 1.602*10^-19, right??
What are all the multiples of that and how would you find that?
 
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