9 янв 1997 г. - Thomson
Описание:
In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas.Добавлено на ленту времени:
Дата:
9 янв 1997 г.
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~ 27 г назад
