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RE: The Double-Slit experiment

Posted by Paul Eizik (A) on May 30, 2015 at 11:43:38

In Reply to: RE: The Double-Slit experiment posted by Tre' on May 30, 2015 at 09:22:37:

At 3:54 in the video it's mentioned that a "measuring device" is placed "by one slit". This is a singular device not described, and it's located near just one slit. The video is entertaining, and it describes the paradoxical data the scientists were confronted with when this experiment was first done. However it is stuck with the outdated conception of the electron as an indivisible and discreet "ball of matter". If an observation could actually collapse the wave function of the experiment as it's described, then a person looking at the experiment, or not, should have the same effect in a movie of the experiment. Anyway, let's switch to still photography.

Imagine you're sitting in an arm chair, and there's a butterfly flying around the room in a circle above and in front of you. Lets's say this is an electric butterfly which is tethered to the ceiling on a string and nail, and there's enough power in the battery so that the butterfly maintains a constant speed. As the butterfly comes around you snap a photo with a camera with a slow lens and slow film. When you develop the film you see the butterfly as a blurry grey rod about one foot long, and the wing beats as a blurry wave pattern on both sides of the rod. You can tell exactly how fast the butterfly was flying by the length of the blurry rod compared to the shutter speed of the camera. However you can't tell exactly where the butterfly was located, as it was everywhere in the blurry rod.

Next you snap a photo of the butterfly with a camera with very fast lens and film. When you develop this shot you see the butterfly frozen in space time. You can tell exactly where the butterfly was in the room, but you can't tell from the photo how fast it was flying, you can only estimate it's speed by the speed of the shutter, as at a certain high rate of speed the butterfly would start to blur. An observer looking at just the photo could'nt tell if the butterfly was moving or standing still in one place, as the image is frozen in space and time. In a manner of speaking you could say that the photo with the fast film and lens had collapsed the wave function, however this is a rather one dimensional view of the event of the butterfly flying around the room.

The act of observing something creates a conceptual model of it, and this is certainly subject to change. In the 1920's Bohr and Heisenberg got together and came up with the Copenhagen Interpretation which theorized that matter propagates as waves which collapse into particles when observed. This shoved under the carpet some of the really weird stuff connected with quantum theory like the Klein-Gordon Equation which theorized backward and forward time causality! Anyway, some were attracted by the implication of the Copenhagen Interpretation that human observation creates reality, as the creator of the video suggests.

Paul

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