The infamous double slit experiment is the grandfather of quantum mechanics. It formed the main cornerstone of the exploration of quantum mechanics. Scientists were baffled and it caused them to forever step into the mysterious and strange world of quantum physics. After the findings in the double slit experiment, a huge debate began, the question being: Is matter made up of particles or is it waves? That is the fundamental question and the basis of quantum mechanics.
The experiment
Curious about what mysteriously happened in this experiment that baffled scientists? Ponder no more. The experiment is explained to you below, in easy-to-follow terms.
Step 1 | Step 2 | Step 3 | The twist |
Step 1
The first step in the double slit experiment was to fire balls of matter such as marbles or paintballs through two slits. What do you think happened? As expected it formed two bands on the screen behind the slits (see Screen 1).

Screen 1 (click photo to enlarge)
Parts |1|2|3|

back to top