Dr Quantum - Double Slit Experiment

Submitted by: ElectricEye 1 year ago Science

What the Bleep Do We Know!?
There are 18 comments:
Male 3,314
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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Male 128
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.
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Male 195
Everybody looking for a threesome.
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Female 2,691
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.
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Male 4,746
@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.
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Male 36,299
@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...
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Male 14,773
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
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Male 14,773
Heisenberg (not Walter White)
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Male 36,299
@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!
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Male 3,314
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.
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Male 15,832
[quote]This means matter changes when observed by everything?[/quote]
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.
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Male 15,832
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.
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Male 92
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
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Male 7,898
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.
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Male 5,874
The act of observing absorbs a certain amount of energy from the object being observed, thus altering it`s characteristics.
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Male 257
wave/particle duality for the win/loss!

(see what i did there?)
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Male 7,898
Schrodinger`s cat
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Male 2,729
Link: Dr Quantum - Double Slit Experiment [Rate Link] - What the Bleep Do We Know!?
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