Gamma rays were discovered by:

Correct answer: Paul Villard. Paul Villard discovered gamma rays in 1900.

Background: He discovered them while studying radiation from radium.

• Rontgen: Röntgen discovered X-rays.
• Becquerel: Becquerel discovered radioactivity.
• Curie: The Curies discovered polonium and radium.

Did you know? Gamma rays have the shortest wavelengths in the electromagnetic spectrum.

Memory trick: Villard = gamma.