Electron - electric particle or Photon - light particle -) then it would behave like a particle.Would the scientist in an experiment attempt to measure interference then it would build up interference.Of course this was something that drove science nuts. How can light change its behaviour depending on the survey done?To make things clear a famous test was done. A Photon gun was developed which would shoot one photon at a time on a screen. That way the behaviour of the photon would be observable. To make the observance of interference possible another blockade with two holes for exactly one photon was placed between screen and photon gun. A photon shot would go through one of the two holes and project an image on the screen.When a series of photons were shot, the photons arrived on the screen in a pattern of interference.This alone was astonishing. It meant that one photon could interfere with itself! The path of one photon through the holes was not predictable. There was a certain probability where it would arrive to build the pattern of interference, but there was no way to exactly predict where it would go.There was no causality only a probability where it would go.Now the interesting question was through which of the holes did the photons travel?Two detectors were fixed on the holes and sometimes the photons choose one hole and sometimes the other. Again it was not predictable which hole they would choose.Excellent, but now the interference on the screen was gone! The photons went straight through to two points (one for each hole on the screen) and did not interfere with themselves anymore. If the detectors would be switched off the interference they would be there again!Based on these behaviours Heisenberg formulated his Principle of Uncertainty.He said that only certain features of a particle can be observed.Either one can observe the where the particle is, then nothing can be known about the direction and speed of its travel, or i...
