Question

Who discovered radioactivity?

Answer 1

Radioactivity was discovered by French physicist, Henri Becquerel.

Discovery of radioactivity

1. Becquerel has an idea that radiations similar to x-rays would be emitted by uranium salts after absorbing sunlight. To evidence this idea, Becquerel placed uranium crystals in photographic plates wrapped in black paper and exposed the set up to the sunlight. He could see the outlines of crystal on developed. photographic plates.
2. Becquerel also reported that without any stimulation from sunlight, uranium emit radiations. The scientist could evidence the event by discovering crystal lines on photographic plates kept in dark place with uranium crystals.