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jan 1, 1897 - Thomson showed that cathode rays were composed of previously unknown negatively charged particles

Description:

Thomson showed that cathode rays were composed of previously unknown negatively charged particles, which he calculated must have bodies much smaller than atoms and a very large value for their charge-to-mass ratio.

Added to timeline:

16 Oct 2018
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Date:

jan 1, 1897
Now
~ 129 years ago