The correct answer is: B. Anderson
Carl David Anderson (1905-1991) was an American physicist who won the 1936 Nobel Prize in Physics for his discovery of the positron, the antiparticle of the electron. He was born in New York City and studied at the California Institute of Technology, where he received his Ph.D. in 1930. After working at the University of Chicago, he joined the faculty of the California Institute of Technology in 1933.
In 1932, Anderson was studying cosmic rays when he observed a particle that had the same mass as an electron but a positive charge. He named this particle the positron, and its discovery proved the existence of antimatter. Anderson’s work on the positron was a major contribution to the development of particle physics.
The other options are incorrect:
- A. Fermi was an Italian-American physicist who won the 1938 Nobel Prize in Physics for his work on nuclear fission.
- C. Bohr was a Danish physicist who won the 1922 Nobel Prize in Physics for his work on atomic structure.
- D. Bethe was a German-American physicist who won the 1967 Nobel Prize in Physics for his work on nuclear reactions.