Multiple choice

Which of the following discoveries did Roentgen discover?

  1. Gravitation

  2. Relativity

  3. X-rays

  4. Radioactivity

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Wilhelm Conrad Roentgen discovered X-rays in 1895. Gravitation is attributed to Newton, relativity to Einstein, and radioactivity to Becquerel.