Electron Charge to Mass Ratio/Historical Note

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Historical Note on Electron Charge to Mass Ratio

When an electrode is charged to a high electric potential in a high vacuum, it is observed to emit rays.

This had been established over the course of several decades of experiments by a number of workers.

These rays were called cathode rays.

It was the work of Joseph John Thomson in $1897$ to attempt to establish some basic facts about these cathode rays.


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