Question

While investigating which phenomena was Becquerel studying uranium salts when he discovered radioactivity?

Options

• Fluorescence and phosphorescence

• Chemical reactions of metal salts

• Magnetic effects of electric current

• Electrical conductivity of gases

Answer 1

Becquerel studied uranium salts while investigating fluorescence and phosphorescence. During this investigation, he observed that a covered photographic plate was still exposed, which could not be explained by ordinary visible light.