How did Henri Becquerel?

The discovery of radioactivity

his hypothesis was that uranium salt gives off x-rays would pass through the paper and produce an image on the film.

Antoine Henri Becquerel (December 15, 1852 - August 25, 1908) was a French physicist, Nobel laureate, and one of the discoverers of radioactivity with his investigations of uranium and other...

He discovered Nuclear energy and x-rays

Henri Becquerel discovered radioactivity, together with the famous Marie Curie. The word "Becquerel" is now used as an S.I. unit of radioactivity. 1 Becquerel (Bq) means that 1 nucleus decays each...