Röntgen discovered x-rays, and Becquerel discovered radioactivity. (1 янв 1895 г. – 23 ч 59 мин, 31 дек 1895 г.)

Описание:

They utilized cathode rays and uranium-enriched substances.
Röntgen found that radiation penetrated matter, darkened photographic plates and caused fluorescence. He also discovered that x-rays couldn't be deflected by a magnet and therefore couldn't contain charged particles.
Becquerel accidentally discovered that exposing wrapped photographic plates to a uranium compound caused them to darken even without cathode rays. This spontaneous emission of particles and/or radiation was named radioactivity

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