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Category: Science
Date: 06/16/15 09:04 AM

18 Responses to Dr Quantum – Double Slit Experiment

  1. Profile photo of ElectricEye
    ElectricEye Male 50-59
    2729 posts
    June 16, 2014 at 7:17 am
    Link: Dr Quantum - Double Slit Experiment - What the Bleep Do We Know!?
  2. Profile photo of HolyGod
    HolyGod Male 30-39
    6894 posts
    June 16, 2014 at 9:19 am
    Schrodinger`s cat
  3. Profile photo of captkava
    captkava Male 40-49
    257 posts
    June 16, 2014 at 10:06 am
    wave/particle duality for the win/loss!

    (see what i did there?)
  4. Profile photo of Nickel2
    Nickel2 Male 50-59
    5879 posts
    June 16, 2014 at 10:22 am
    The act of observing absorbs a certain amount of energy from the object being observed, thus altering it`s characteristics.
  5. Profile photo of HolyGod
    HolyGod Male 30-39
    6894 posts
    June 16, 2014 at 11:28 am
    1 theory is that whenever an event happens all possible outcomes exist in their own separate dimensional timeline. Only after we observe it do we know what timeline we currently exist on.
  6. Profile photo of DutchWeed
    DutchWeed Male 18-29
    92 posts
    June 16, 2014 at 12:13 pm
    This "The act of observing absorbs a certain amount of energy from the object being observed, thus altering it`s characteristics." and the explanation from the video freak me out.

    This means matter changes when observed by everything? or just the things that understand it?

    or did the measuring equipment change the outcome?

    weird stuff for sure
  7. Profile photo of OldOllie
    OldOllie Male 60-69
    15841 posts
    June 16, 2014 at 1:32 pm
    Electrons and other quanta simply do not exist as point particles; however, when they interact with other particles, as they must do in any observation or when the electron hits the wall, the wave function collapses, and they interact at a single point.

    The wave function describes the probability of the particle interacting at a particular point.
  8. Profile photo of OldOllie
    OldOllie Male 60-69
    15841 posts
    June 16, 2014 at 2:50 pm
    This means matter changes when observed by everything?
    Yes. Observation at the quantum level is not passive. You cannot observe anything without interacting with it. You can only see an object in your everyday environment because photons are being scattered from it. At the quantum level, though, even a single photon will affect the state of the particle with which it interacts.

    You cannot tell the exact position of, say, an electron, because (are you ready?) the electron doesn`t HAVE an exact position until you interact with it. It`s just a smeared-out wave (unless it`s constrained by a potential such as being bound to an atom).

    It`s always dicey to make analogies with the macroscopic world, but imagine a thundercloud. It contains a quantity of electric charge, but where, exactly, is that charge located? It doesn`t exist in one place, but when a lightning bolt from that cloud strikes a tree, for a short time you know exactly where it is.
  9. Profile photo of Rick_S
    Rick_S Male 40-49
    3290 posts
    June 16, 2014 at 7:54 pm
    I remember learning in college that any sized object will produce the wave pattern in the double slit experiment. It`s just that the size slit you need to cause the wave pattern is going to be several orders of magnitude smaller than the object if you go beyond the photon/electron type stuff.

    I computed the size slit you would need to create the interference pattern with baseballs back then. I don`t remember the result, but I do remember that it was very small, and that even the thread on the baseball couldn`t pass through the slit.
  10. Profile photo of 5Cats
    5Cats Male 50-59
    33070 posts
    June 16, 2014 at 8:25 pm
    @captkava: I SEE what you did OR DID NOT do there! ;-)

    @hg: Schrodinger`s Cat! = yes!
    Everett-Wheeler (Many Worlds Theory) = Nope!

    I`m a "ONE world theory" kind of cat! Parmenides is my hero! (Along with Zeno!!)

    @OldOllie is correct: Electrons do not exist until we observe them! Measure, detect, see how other things react, they`re slippery little... things!

    @Rick_S: I`ve read the opposite of that. Probably RA Wilson. When big objects actually do the double slit? They make 2 lovely, clean lines. Reflecting off the edges does NOT make the highly re-producible multiple lines of an interference pattern. It makes random dots here and there.
    iirc, of course!
  11. Profile photo of Draculya
    Draculya Male 40-49
    14651 posts
    June 16, 2014 at 9:26 pm
    Heisenberg (not Walter White)
  12. Profile photo of Draculya
    Draculya Male 40-49
    14651 posts
    June 16, 2014 at 9:44 pm
    I`ll tell you what blows my mind: not the electrons, but much larger molecules of up to 10,000 atomic masses also exhibit this behaviour.

    Also, if you think you have gotten your head round the double slit experiment and want to deepen your mind-fck:

    Delayed Choice Quantum Eraser
  13. Profile photo of 5Cats
    5Cats Male 50-59
    33070 posts
    June 16, 2014 at 11:36 pm
    @Draculya: Heisenberg? Close, but it`s a different matter.

    Photons have even less claim to "mass" than electrons! For them to be a wave is less "far fetched" although it`s also hard to believe.

    Essentially?
    WE DO NOT KNOW IT ALL!
    At least not yet.
    To pretend otherwise is Hubris...
  14. Profile photo of patchouly
    patchouly Male 40-49
    4746 posts
    June 17, 2014 at 5:10 am
    @HolyGod,
    Yes. As creepy as I always find it, the idea that things aren`t static until you make them static does lend credence to the Multiple timeline/Universe theory. It really sort of explains how it works.
  15. Profile photo of SavageChef
    SavageChef Female 50-59
    2692 posts
    June 19, 2014 at 12:58 am
    It`s like Doctor Demento went on a diet and became a scientist. Cool. However, I`m still too stupid to understand the explanation. Slow it down to extra-dumb, and I`ll watch it again.
  16. Profile photo of axeman929
    axeman929 Male 30-39
    195 posts
    June 21, 2014 at 12:39 am
    Everybody looking for a threesome.
  17. Profile photo of BuckeyeJoe
    BuckeyeJoe Male 40-49
    123 posts
    June 16, 2015 at 10:17 am
    Wave-particle duality and the uncertainty principle are ultimately the same thing on a fundamental level. The particular manifestations belie the only conceptual difference.

    The physical theory makes no claim about the exactness of a system, but instead only about our probability for observing it. It is not the electron itself that is in a superposition of states, but instead the probability for observing it. I recommend reading Dirac`s Principles of Quantum Mechanics.

    Physics does NOT say that things do not exist until we observe them. That is just more What-The-Bleep hippie nonsense. The PROBABILITY collapses once we observe it, not the electron itself.
  18. Profile photo of Rick_S
    Rick_S Male 40-49
    3290 posts
    June 16, 2015 at 1:13 pm
    I remember learning about this in college. There`s a formula for the size of the slit compared to the length of the wave. Everything has a wavelength, so in theory, everything should act like a wave with the double slit. But the formula shows that for macro sized objects, like a baseball, or a marble, the slit size that is needed to produce the interference pattern is smaller than the size of the object. So macro sized object can`t ever be seen as behaving like waves, even though they, too, have a wave length.

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