In 1801, English scientist Thomas Young performed an experiment that changed our understanding of reality forever. He directed a beam of light at a barrier with two narrow parallel slits. On the wall behind the barrier, he did not see two bright lines as expected for tiny particles. Instead, he saw an alternating pattern of bright and dark stripes known as an interference pattern, proving light behaves like a wave.
More than a century later, physicists repeated the double slit experiment using individual particles of matter, such as electrons. Even when fired one at a time, each electron seemed to pass through both slits simultaneously, interfering with itself and forming the exact same wave pattern on the detector.
The real shock came when scientists placed detectors at the slits to see which slit the electron actually passed through. The moment the particles were observed, the wave pattern vanished, and they behaved strictly like tiny solid bullets. Simply observing the experiment changed its physical outcome.
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Disclaimer: This video is for informational and educational purposes. Scientific details are sourced from public academic records and visual depictions are illustrative.
