Quantum Laser Pointers brings you the famous
double-slit experiment right in the palm of your hand
• Length of Laser 6.2 cm
• Length of Carabiner 4.2 cm
• battery: 3pcs * AG13
• Wattage: 4.5V
• Amps: 30*35mA
Physicists have succeeded in confirming one of the theoretical aspects of quantum physics: Subatomic objects switch between particle and wave states when observed, while remaining in a dual state beforehand.
Actual interference pattern created by double slit laser
One of the deepest mysteries in quantum physics is the wave-particle duality: every quantum object has properties of both a wave and a particle. Nowhere is this effect more beautifully demonstrated than in the double-slit experiment: streams of particles, photons and electrons are directed at a barrier with two narrow openings. While each particle shows up at the detector individually, the population as a whole creates an interference pattern as though they are waves. Neither a pure wave nor a pure particle description has proven successful in explaining these experiments.
The original double-slit experiment was performed by English physicists, Thomas Young in 1801. In Young’s version of this experiment, a coherent beam of light, illuminates a plate pierced by two parallel slits, and the light passing through the slits is observed on a screen behind the plate. By allowing light to pass through two slits onto a screen, Young found that the light beams spread apart and overlapped, and, in the area of overlap, bands of bright light alternated with bands of darkness. Physicist's recognize these alternating dark and light bands as a classic interference pattern. Variations of the experiment have spurred vigorous debates between Albert Einstein and Neils Bohr and the true nature of reality. The modern double-slit experiment is a demonstration that light and matter can display characteristics of both waves and particles, thus displaying the fundamentally probabilistic nature of quantum mechanical phenomena.
One of the most famous scientific meetings of all time occurred in 1927. There were twenty-nine attendees, including seventeen that were or would become Nobel prize winners. What this conference was remembered for was a debate between two of the titans of physics:
Albert Einstein and Neils Bohr.
At the center of the debate was the true nature of reality, and was light a particle or a wave. Some experiments indicated light behaves like waves. Other experiments concluded light was a particle. These seemingly contradictory observations could be reconciled. Neils Bohr proposed, in what has become known as the Copenhagen interpretation, that particles do not exist unless someone was looking at them. The mere act of observation is what caused the existence of the particle. In Bohr's own words, the entities had no "independent reality in the ordinary physical sense.” Einstein was dead set against this view famously stating, “ I like to think the moon is there even if I am not looking at it." Einstein and Bohr continued their spirited debates for many years to come. The two titans of physics very much respected each other and remained good friends until Einstein’s death some
three decades later.
Neils Bohr and Albert Einstein
Through all its Quantum weirdness, Bohr's Copenhagen interpretation remains one of the most
widely accepted worldview’s of physics. Leading Neils Bohr to say,
“Anyone not shocked by quantum mechanics has not yet understood it."
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