Thomson's discovery of the electron in 1897 proved that charged particles existed, but the magnitude of their charge was entirely unknown. Using this mass and the known strength of the electric field, they could solve for the charge (q) using the simple equation qE = mg, where E is the electric field, m is the mass, and g is the acceleration due to gravity.
Data Calculations Value e Millikan Oil Drop: Quantifying the Electron's Charge
The droplets could carry 1e, 2e, 3e, or other multiples of the elementary charge, but never a fractional value of that base unit. By measuring the terminal velocity of a droplet during its free fall, they could calculate its mass and, consequently, the gravitational force acting upon it.
These droplets fell through a small hole into a region between two parallel metal plates. 5924(17)×10−19 coulombs, astonishingly close to the currently accepted value of 1.
Data Calculations Value e Millikan Oil Drop
Millikan's methodology transformed a seemingly chaotic observation of falling droplets into a rigorous determination of a universal constant, solidifying the foundation of modern physics and reshaping our understanding of the subatomic world. Observing the Quantum Nature of Charge While the ability to hold a droplet stationary was a significant achievement, the true genius of the experiment emerged from the repeated trials conducted on numerous droplets.
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More perspective on Millikan's oil drop experiments can make the topic easier to follow by connecting earlier points with a few simple takeaways.
