Which scientist's theory helped in understanding nuclear fission?

The correct answer is Neils Bohr, who contributed significantly to the understanding of nuclear structure and quantum mechanics, which laid the groundwork for the theory of nuclear fission. His model of the atom, known as the Bohr model, described how electrons orbit the nucleus at certain energy levels, a concept that was crucial for understanding the behavior of atoms during nuclear reactions.

Bohr's research included work on the energy levels of atomic nuclei and their stability, which directly relates to the process of nuclear fission, where the nucleus of an atom splits into smaller parts, releasing a significant amount of energy. His collaboration and discussions with other prominent scientists of his time further propelled the understanding of nuclear reactions, especially during the early 20th century when fission was first being explored.

This theoretical framework established by Bohr was pivotal in helping other scientists understand how nuclear fission could occur and how it could be harnessed for both energy production and weaponry, making his contributions fundamental to the development of nuclear physics.