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If we observe the electron near the slit, does it produces two bands instead of interference pattern. Also how do we observe electron. Is it by producing electric field. Also does double slit experiment only works with coherent sources of light or all sources? What do you think about the below explanation of wave. http://www.bioinsilico.blogspot.in/2015/03/intelligence-and-in-search-of.html In the figure, the length of up and down represents amplitude and the speed of up and down represents wavelength. If we are observing electrons by producing electric field, won't it disturb the wave nature of electrons.

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closed as unclear what you're asking by CuriousOne, user36790, John Rennie, ACuriousMind, Martin Sep 7 '15 at 12:33

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  • $\begingroup$ As a general hint: the double slit experiment is of absolutely no value in the history of physics and it seems to confuse so many people about the nature of quantum mechanics that we should stop talking about it. It does no good but it seems to do an incredible amount of intellectual harm. I would suggest you go back to the real basics of quantum mechanics (photo effect, black body spectrum and atomic spectra) and try to bootstrap yourself into it from there. $\endgroup$ – CuriousOne Sep 6 '15 at 2:59
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If we observe the electron, does it produces two bands instead of interference pattern. Also how do we observe electron.

Depending on the distance between the two slits, there is interference. If the slits are too far appart with respect to the momentum of the electrons ( heisenberg uncertainty) then two blobs will appear. Here is an one electron at the time experiment with electrons:

singleelectron ds

Is it by producing electric field.

In the above experiment the electron hits a screen and leave a point on the screen ( electromagnetic interactions with the chemicals of the screen are involved)

Also does double slit experiment only works with coherent sources of light or all sources?

It works one particle ( photon or electron or ..) at a time. Coherence, is useful so that the points do not overlap and erase the image.

What do you think about the below explanation of wave.

Not relevant to the real physics at the elementary particle level.

If we are observing electrons by producing electric field, won't it disturb the wave nature of electrons.

The wave nature of the electron or any other massive particle is not a wave in energy or mass or charge. It is a sinusoidal probability of interaction wave, the probability of the electron being observed at (x,y) at the z of the screen. One electron shows no interference because probability is a distribution from many instances, and that is what is seen in the experiment.

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  • $\begingroup$ Oberving I mean is not at the screen but at the slits. Also if the slits are farther apart we maynot have interferance pattern but does electron still behaves as waves i.e. a strong band at the middle and band of low intesity away from it. $\endgroup$ – user1566713 Sep 6 '15 at 7:16
  • $\begingroup$ When one observes at the slits the quantum mechanical boundary conditions change and a different probability function is obtained. see this phys.org/news/… . Each electron hits one spot on the screen or detector . It depends on the boundaries of the beam when an accumulation happens. $\endgroup$ – anna v Sep 6 '15 at 7:45
  • $\begingroup$ "Then they modified one of the slits by covering it with a filter made of several layers of “low atomic number” material to create a which-way detector for the electrons passing through." I have a questions in this experiment. Do screen produced one electron point for each electron shot same as above experiment you described. This experiment even don't confer that it electron passes through both the slit. We can say that one passes through one slit and when we bombard next it passes through other slit with equal probability. $\endgroup$ – user1566713 Sep 6 '15 at 8:01
  • $\begingroup$ Also low atomic number material has charges on it, electrons an protons. It may be interfering with wave character of electrons. $\endgroup$ – user1566713 Sep 6 '15 at 8:02
  • $\begingroup$ What about other experiments? How do they dictate the electrons near slit using detector. Is it by producing electric field? $\endgroup$ – user1566713 Sep 6 '15 at 8:04

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