Фотоэффект
Мотивация
![Motivation image](http://www.ises.info//ises_data/experiment/photoelectric-effect-VA/motivation.jpg)
Phototubes as fast detectors of light intensity served well for playing audio-tracks
and contributed to the entertainment of many people in cinemas, for example. Furthermore, the photoelectric effect
supported one of the pillars of the modern physics to be accepted – the quantum hypothesis.