Question

When j. j. thomson discovered the electron, what physical property of the electron did he measure?

Answer 1

When j. j. Thomson discovered the electron, the physical property of the electron that he measure the mass of the electron.

What did J.J. Thomson discover?

J.J. Thomson was known to be a man who measured the physical property of the electron mass.

Note that in his experiment, he did not make measurable mass but  he was known to have made  the mass-to-charge ratio of electrons.

Therefore, based on the above, one can say that When j. j. Thomson discovered the electron, the physical property of the electron that he measure the mass of the electron.

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