Question

Niels Bohr’s theory was based on

Answer 1

The discoveries of the electron and radioactivity at the end of the 19th century led to different models for the structure of the atom. In 1913, Niels Bohr proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted. Bohr's theory could explain why atoms emitted light in fixed wavelengths.-  Niels Bohr – Facts. NobelPrize.org. Nobel Media AB 2019. Tue. 8 Jan 2019. <https://www.nobelprize.org/prizes/physics/1922/bohr/facts/>

Answer 2

Answer:

Quantum theory.

Explanation:

Neil Bohr's in the 1913 delivered a theory which is for the hydrogen atom which is based on the theory of quantum which says energy is transferred only in certain  quantities which is well defined.

Electrons which are moving in outer orbit should moves around or about the nucleus.

When going from one level to another level energy is emitted or absorbed which is based on when electron jump from higher level to lower level emission of light quantum is  takes place.