He realized that Rutherford's model wasn't quite right ... of light emitted by real hydrogen atoms. Bohr's theory that electrons existed in set orbits around the nucleus was the key to the ...

(Thomson’s model/ Rutherford’s model ... 6. (a) Using Bohr’s model calculates the speed of the electron in a hydrogen atom in the n = 1, 2, and 3 levels. (b) Calculate the orbital period ...