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/sci/ - Science & Math

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1288212 No.1288212 [Reply] [Original]

http://www.youtube.com/watch?v=DfPeprQ7oGc

Ok where can I read more about this? how is it that particles react when being observed? WHY do they react?

>> No.1288222

>how is it that particles react when being observed? WHY
Photons reflect off the observed object into your eye. When the object is small enough that it's path is influenced by the observed photon, you get some issues.

>> No.1288233

Why are you talking about particles? The double slit experiment pertains to waves. Also photons fucking with particles during observation is part of the uncertainty principle.

>> No.1288237
File: 1.39 MB, 1156x3352, Double-slit_experiment_results_Tanamura_2.jpg [View same] [iqdb] [saucenao] [google]
1288237

>>1288212
Each photon/electron passes through BOTH slits, and interferes with itself. Obviously, this only works for slits that are pretty close together.

Cool, huh? Here's a pic from the experiment with electrons by Tonomura et al.

>> No.1288260

>>1288212
Particle-wave duality

>> No.1288290

You are asking why, if you try to determine which slit the photons are going through, the result of the experiment changes?

In order to reveal the photon it has to interact with something, this interaction changes its wavelength. Two waves with different wavelengths can't form the same diffraction pattern as before.

>> No.1288304

>>1288290
Ok that makes a lot more sense.

>> No.1288344

Path integrals. This is why we love Feynman. You 'sum' all possible paths of the particle, each having a relative amplitude, and these amplitudes interfere for the most part to leave you with the actual path taken by the particle. This is where that whole 'it goes through both holes' thing comes from. It doesn't actually do that, however integrate over all these possibilities, you can recover the actual results of 2-slit experiments.