Imagine throwing two rocks into a pond—the waves merge and interact. Now picture two lines of billiard balls colliding—they crash and scatter. One behaves like a wave, the other like particles.
The double-slit experiment flips this logic upside down. Physicists send single atoms toward two slits. Instead of moving predictably like bullets, they act like waves—landing in a strange pattern that suggests true randomness.
This experiment shattered old ideas. Before it, scientists thought light needed a medium to travel, just like sound. But we now know—light is different. It moves through space with no medium at all.
The double-slit experiment remains one of the biggest mysteries in physics. Wave or particle? The answer seems to be… both.
For a more, take the deep-dive: The Double‐slit Experiment Explained.