For which discovery in 1932 was James Chadwick best known?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Neutron.
James Chadwick is best known for his discovery of the neutron in 1932. This was a groundbreaking moment in nuclear physics, as it revealed the presence of a neutral particle within the atomic nucleus, alongside protons. The discovery of the neutron helped scientists better understand atomic structure and paved the way for advancements in nuclear energy and atomic research. For his contribution, Chadwick was awarded the Nobel Prize in Physics in 1935, recognizing his vital role in modern atomic theory.