In regard to the Stern-Gerlach experiment, what happens if the field starts out homogenous or very weak, and is slowly changed to the strong inhomogenous field described in the experiment? There are two versions of this, what might be called “transition period” question. One would be . . . A. If the field starts out full strength, but homogenous, and then the geometry is slowly altered, when do the atoms react to the field and exhibit measured changes in their spin orientation? B. If the field starts out very weak, but inhomogenous, and then is increased in strength, when do the atoms react to the field and exhibit measured changes in their spin orientation? My guess would be that the probabilistic nature of quantum physics would show itself in this way as well. I would think that as the geometry of the field is altered (A) or as the strength of the altered field is increased (B), at first almost none of the atoms would react, but as the changes became more exaggerated, a larger and larger proportion of the atoms would react to the field, until the fields are altered to the point where all the atoms react. In this “transition period,” would the speed at which the atoms passed through the field have an impact of the number of atoms reacting to the field? If the field is very weak (so that only a fraction of the atoms responded to the field, would there be are a higher number reacting if the atoms were passing through the field slowly (spending more time in the field) than if they passed through the field quickly?