422 



One can also try to illustrate other phenomena by means of the 

 model. In its passage from one stationary state of motion to another 

 an electron may be imagined to go through the circuit s of a 

 vibrator, so that the energy which it loses is first imparted to the 

 vibrator and then radiated by it. Conversely, after having taken in 

 some way from a beam of incident light the energy hv, the vibrator 

 could give this energy to an electron that passes through it at the 

 right moment. But in all this we are confronted with very 

 serious difficulties. 



