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Radioactive Phenomena
In spring of 1912 while working in Professor Rutherford's lab Bohr made inquiries into radioactive phenomena, Because of this he did a theoretical paper on the absorption of alpha rays which was then published in the philosophical magazine a year later. -
Atomic structure
Some time after his theroretical paper in 1913 Bohr continued on to structure of atoms. Using some concepts from Quantum theory which was presented by planck in 1900, he was able to work out and present a picture of the structure of an atom. -
Concept of Complementarity
Bohr came up with the concept of complementarity which mainly focuses on quantum theory but extends out to other fields as well. In this concept Bohr said we are both actors and spectators. This is because the development of quantum theory suggests that there is no purely detached standpoint and even the scientists get dragged into the drama of the world which makes them actors and spectators too. -
Liquid Droplet Theory
in 1936 Bohrs pointed out atomic processes happening within in the atom itself and how small the space was that it was happening as well as the strength of those interactions as well. This led to his liquid droplet theory where a liquid drop gives a good picture of the nucleus of an atom. This theory led to the later understanding of the mechanisms of nuclear fission.