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The Double Slit experiment

Hits: 46367 | Rating: (3.6) | Category: Science | Added by: ICN
Page: 13 4 5 6 7 8 Next >   Jump to: Bottom    Last Post
Female, 18-29, Western US
 934 Posts
Tuesday, July 31, 2007 1:28:03 AM
Holy moly, that's some trippy stuff.

Male, 30-39, Canada
 3 Posts
Tuesday, July 31, 2007 12:44:02 AM
BTW, a lot of you seem to be saying that an animation proves nothing. Duh! Of course. But this experiment ("the double slit experiment") has been performed countless times - using multiple electrons, single electrons, other nuclear and atomic particles, etc. And each time, the same result occurs: a single particle seems to "interact with itself" but that interaction does not occur whenever a measurement or observation is made as to which slit the particle takes.

Oh, no less a figure than Richard Feynman said, "the result of the double slit experiment is the CENTRAL MYSTERY of quantum theory". He then corrected himself, saying that in fact it is "the only mystery. If you understood it, you would understand quantum physics, but nobody understands quantum physics"

Male, 18-29, Southern US
 7 Posts
Tuesday, July 31, 2007 12:39:52 AM
I’ve heard the universe we know is made up of 11 dimensions. We all know the X, Y, & Z dimensions, but there is also time, nothing, and a dimension of consciousness… I have no idea how far it goes, but it would not surprise me if there is some level of awareness in every little drop of matter we can (or can’t) see.

Male, 18-29, Europe
 22 Posts
Tuesday, July 31, 2007 12:31:49 AM
to make it clear there is a fact that is ignored i think. photons are small energy packets and when you use light you fire multiple packets at a time which makes u think its a wave but when u come to the electrons u fire at a time and try to observe it it cofuses you. when you reverse the experiment for photons and electrons nothing changes it is the fact that they are (to say easily) different versions, appearences of each other (when you look at the board) and it is easy(for now) understanding the statistics they create not them 1 by 1.

Female, 18-29, Western US
 448 Posts
Tuesday, July 31, 2007 12:29:05 AM
This looks like some sort of spin-off on that movie "What The Bleep Do We Know?," and for those of you unfamiliar with it, it's a movie where quantum physics experiments are oversimplified and misinterpreted to create a sort of new-agey, "create your own destiny" view of reality. To claim that this sort of presentation proves your wacko theory of the meaning of life is simply wishful thinking, seeing what you want to see.

So, though the explanation of this experiment is technically acurate, don't go thinking you can alter reality with nothing more than willpower; such logic is likely to land you in a detox facility or in a room with padded walls.

Male, 18-29, Southern US
 17281 Posts
Tuesday, July 31, 2007 12:18:06 AM
He's got it right on the observation tool inevitably slowing down the photon.

By the way this is terribly Copenhagen interpretation biased!!! As a MWI proponent, I'm offended.

Male, 18-29, Southern US
 312 Posts
Tuesday, July 31, 2007 12:13:25 AM
Your hypothesis is interesting Mcfly, but I'm sorry I just can't take you seriously. I can put on the internet that I'm a monkey trainer/intergalactic space traveler, or whatever I want. I took those classes too. See how easy it was to make up some BS?

Cool vid btw.

Male, 30-39, Canada
 3 Posts
Monday, July 30, 2007 11:51:26 PM
"Anyone who is not shocked by quantum theory has not understood it" - Nils Bohr (Nobel Prize, Physics, 1922, and postgraduate supervisor of about another couple of dozen Nobel Prize winners)

Male, 13-17, Eastern US
 1201 Posts
Monday, July 30, 2007 11:06:43 PM
this reminds me of speed of light paradoxes. pretty cool stuff. wonder what we'll find out

Male, 18-29, Midwest US
 26 Posts
Monday, July 30, 2007 10:35:47 PM
I took general physics and AP in highschool, and then two years of engineering physics in college. I know what I'm talking about.

Male, 18-29, Midwest US
 26 Posts
Monday, July 30, 2007 10:34:33 PM
The electron's ability to travel at near the speed of light is what allows it to exist in almost every position at once, and to pass thru both slits at once, and to interfere with itself. Interaction with the detector messes up the interference.

Look at it this way. If two electrons were fired, side by side, one at the left slit and one at the right, we would assume that each would pass thru its respective slit, and interfere with each other on the far side, causing a wave pattern on the wall. But if a detector is placed in the right slit, the electron that passes thru that slit is slowed down minutely by having to interact with the detector. This throws off its timing with the other electron, so they no longer interfere with each other. This process works the same with just one electron, as shown in the video. The detector that is used interferes with the experiment, and causes the particle pattern to appear instead.

Male, 18-29, Western US
 128 Posts
Monday, July 30, 2007 10:11:15 PM
Actually McFlyyy is right...sort of, but obviously we are not going to settle this in a comment section on the internet so just let it go people and read a book. Ohhhh Harry Potter is out now!!!

Female, 18-29, Europe
 2 Posts
Monday, July 30, 2007 6:46:40 PM
Ok, to mcflyy again,
What's going on-> the way we 'observe' something makes it act like it is. as in this is what's going on. it's not like we don't know what is going on. This is what is going on!
There is plenty of mathematics to explain this! It's not just that the detector is there, it's the whole process of 'observing' that collapses the wave function to what it is!(this is why there's an interference pattern, because it covers all processes). It's more that our minds aren't sophisticated enough to grasp the concept. This does happen!(but again opposed to the electron 'knowing' what happened it is down to mathematics which clearly won't be explained here!)

Male, 18-29, Midwest US
 26 Posts
Monday, July 30, 2007 3:58:33 PM
The whole point that this video doesn't make clear is that it's just the detector that is interacting with the electron, and that messes up its wave interference pattern. This isn't some wierd phenomenon that can't be explained, it's just that we don't have a sophisticated enough way to detect what's going on without interfering with the experiment itself.

Male, 13-17, Europe
 34 Posts
Monday, July 30, 2007 3:33:25 PM
hi its chaos theory if you want to get it researcch that and (lol i got this from stargate sg-1 i knew it would be useful someday) if you knew wich way a matter/electron was going it would change therefore you would be able to predict anything norr belive in pyshcic shows because how are they going to know the current position of every peice of matter so there if you knew every peice of matter location you could possibly find out the future but after a good million guesses of what could happen but only 1 might come true wich would probaly be a coinsadence so you wouldnt be able to tell the future but if you did maybe 2 seconds in advance out of a million possibilities but sorry i bragged on about basiclly the same stuff

Male, 40-49, Europe
 383 Posts
Monday, July 30, 2007 3:18:10 PM
Amazing. this tells me we know absolutely nothing about the reality that surrounds us. But we're working on it.

Male, 18-29, Western US
 0 Posts
Monday, July 30, 2007 1:37:18 PM
uhhhhhhhhhhhhggggggggg i dont get it.

Male, 18-29, Europe
 903 Posts
Monday, July 30, 2007 11:03:19 AM
Well, obviously, this is not because of the observation, but because of the disruption of the twin particle which has to be done when observing it.

Female, 18-29, Europe
 2 Posts
Monday, July 30, 2007 9:16:30 AM
hey Mcflyyy. By observation in physics we generally mean an interaction to see what happened, be that with a microscope or a detector which registers pulses or whatever. ie. they are observing the electron by interacting with it!
And it can explained by mathematics using wave functions, but this is a real phenomenon which has been around for nigh on 100 years (unlike string theory :))
the failure is really with the english language as we don't have a word for this wave/particle duality.

Male, 13-17, Europe
 318 Posts
Monday, July 30, 2007 5:03:28 AM
So that does this mean that the saying:
'A watched kettle doesnt boil'
is real?!?!

Male, 13-17, Midwest US
 194 Posts
Monday, July 30, 2007 4:38:56 AM

Male, 18-29, Midwest US
 130 Posts
Monday, July 30, 2007 3:43:06 AM
wow, i absolutely loved this video does anyone know where it came from? i just sent my highschool physics teacher this video and im willing to bet he would buy the whole series. assuming this isnt just a one shot deal, it seems like its some sort of educational tv show. hopefully theres a lot more!!

Male, 18-29, Western US
 3 Posts
Monday, July 30, 2007 2:54:47 AM
Most good. ;p

Female, 13-17, Eastern US
 174 Posts
Monday, July 30, 2007 2:15:14 AM
i didn't get it.

Male, 18-29, Eastern US
 54 Posts
Monday, July 30, 2007 1:16:12 AM
How do you make babies?

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