## 4th Postulate

4th Postulate hydrogen spectrum In other to modify one orbit to another, electron must either emit or absorb energy which is proportional to the distance between the two orbits. Introduction of light energy bring about photon with a wavelength given

## 3rd Postulate

3rd Postulate: As a consequence of the restrictions on the angular momentum of an orbit, the energy of an electron in a given orbit is constant. As long as the electron stays in that orbit, it neither absorbs nor radiates