Proof of Mind Over Matter - The Double Slit Experiment - Physics, Dr Quantum

The modern double-slit experiment is a demonstration that light and matter can display characteristics of both classically defined waves and particles; moreover, it displays the fundamentally probabilistic nature of quantum mechanical phenomena. A simpler form of the double-slit experiment was performed originally by Thomas Young in 1801 (well before quantum mechanics). He believed it demonstrated that the wave theory of light was correct and his experiment is sometimes referred to as Young's experiment[1] or Young's slits. The experiment belongs to a general class of "double path" experiments, in which a wave is split into two separate waves that later combine into a single wave. Changes in the path lengths of both waves result in a phase shift, creating an interference pattern. Another version is the Mach–Zehnder interferometer, which splits the beam with a mirror.

In the basic version of this experiment, a coherent light source such as a laser beam illuminates a plate pierced by two parallel slits, and the light passing through the slits is observed on a screen behind the plate. The wave nature of light causes the light waves passing through the two slits to interfere, producing bright and dark bands on the screen—a result that would not be expected if light consisted of classical particles. However, the light is always found to be absorbed at the screen at discrete points, as individual particles (not waves), the interference pattern appearing via the varying density of these particle hits on the screen. Furthermore, versions of the experiment that include detectors at the slits find that each detected photon passes through one slit (as would a classical particle), and not through both slits (as would a wave). These results demonstrate the principle of wave–particle duality.

Other atomic-scale entities such as electrons are found to exhibit the same behavior when fired towards a double slit. Additionally, the detection of individual discrete impacts is observed to be inherently probabilistic, which is inexplicable using classical mechanics.

The experiment can be done with entities much larger than electrons and photons, although it becomes more difficult as size increases. The largest entities for which the double-slit experiment has been performed were molecules that each comprised 810 atoms (whose total mass was over 10,000 atomic mass units).

[TheDejaBluBand]

No… no… and no… this stems from a misunderstanding of the word observe… think about this for a minute… can you see electrons with your naked eye? No.. you can’t… you “observe” the electron by placing a detector in its path that bounces a photon off the electron back to the detector… that’s how you look at an electron. Bouncing the photon off the electron is what collapsed the wave function, it has nothing to do with a conscious observer other than them being the one that put the detector in the path of the electron.
This video does a good job at explaining the experiment and the results, but just goes completely off the rails when explaining the conclusions of those results.

[damianinness]

shooting a photon at a slit of any measurable size would be like shooting a tennis ball at the earth...the only way it could go through either slit would be if you aimed to either side, so we should never see interference patern
REPLY

[trickdaddy]

What we imagine comes to life. Same as what we observe happens because we subconsciously tell it to.