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Are the results of this test, observable with the naked eye? the change from an interference pattern to two slits once there is some sort device that can detect which slit an electron goes through, or is it so small for some reason it can only be measured? Im just wondering what level of observation is necessary in order for this phenomenon to occur. what is the cutoff point? like if you had a device that could barely detect electrons etc. etc.

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You can. It's basically an interference pattern, and we see these all the time. I imagine you could set something up with a laser pointer, some slotted paper, some aluminum foil, and a black marker.

Jake Watrous
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If you are talking about an at home experiment then shooting individual electrons would be very difficult. Photons would be easier, but still not easy. The way that you see the particle properties of light is you need to fire one at a time so that interference properties are not possible. The strange thing is, the individually fired photons still produce an interference pattern. So the interference pattern will still be created, but it will be created by "particles". A while back I asked a question similar to yours. Here it is:Is there a double slit experiment that I can perform that will show the photons acting like particles?

Lambda
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