The double slit experiment involves passing light through two parallel slits to demonstrate that the light from one slit interferes with that from the other.

learn more… | top users | synonyms

0
votes
2answers
128 views

What happens when one of the double slits are closed?

I was reading "50 quantum physics ideas you really need to know" (by Joanne Baker) and came across an ambiguous paragraph. The topic: Wave-particle duality. It describes a photon that passes through ...
0
votes
1answer
106 views

Double-Slit Experiment Timed

I read an article online about someone somewhere timing the length of time it took a particle to travel from the source to the detector but I have lost all my bookmarks. :( Could someone point me to ...
1
vote
1answer
193 views

Conservation of Energy in Double Slit Experiment

How is energy conserved In Young's Double Slit Experiment ? In destructive interference , energy is lost . So what happens to that lost energy ? Does it escape as heat ?
1
vote
1answer
63 views

What is the exhaustive set of experiments a quantum theory has to satisfy?

Any theory that is to explain the world correctly has to provide a mechanism by which the interesting results of quantum mechanics happen (e.g. diffraction patterns, momentum/position uncertainty, ...
17
votes
7answers
4k views

Does electron in wave form have mass?

I heard from my lecturer that electron has dual nature. For that instance in young's double slit experiment electron exhibits as a particle at ends but it acts as a wave in between the ends. It under ...
0
votes
5answers
456 views

Why do we need a wave function?

Assuming our only aim is to solve double slit experiment (or other problems that can be mapped into that). Knowing that electron does some strange thing not expected of a particle, we need a function ...
0
votes
1answer
107 views

What is the logic behind the thinking that electron must take a complicated path through the two slits?

Electrons moved in lumps, but unlike bullets, there was interference at the backstop. How? How can such an interference come about? Perhaps we should say: "Well, that means, presumably that it is ...
-3
votes
1answer
694 views

Does this experiment on wave-particle duality and complementarity disprove quantum mechanics and prove the EPR viewpoint on it?

I recently read Photons act like they go through two paths, even when we know which they took, at Ars Technica, which reports on the paper Wave-particle dualism and complementarity unraveled ...
0
votes
1answer
31 views

How do I interpret the math relating to diffraction?

The following is a quote from the Haifa Lectures (Mendel Sachs) But if both slits are open, the wave function for the electron penetrating screen S1 is the superposition of states, $(\psi_1 + ...
2
votes
1answer
48 views

Why is the double slit experiment with electrons seem to always be performed in the dark?

Why can't anyone do with the lights on? All the videos I've seen when it is done it is usually done in a dark room, why is that? Will the photons coming from the Lights interfere with the experiment?
0
votes
1answer
83 views

In the Double Slit Experiment, does the measuring device collapse the wave function?

PLEASE READ Many physicist say that the measuring device collapses the electron wave function because it is firing photons in order to measure the electron position. So, what collapses the electron ...
0
votes
0answers
22 views

So far, what has been proven about the definition of an observer? [duplicate]

I've seen people reason that nearly any particle could be an observer, causing electrons in the double-slit experiment to have definite locations. The idea of what exactly the universe/quantum physics ...
2
votes
2answers
118 views

Has this double-slit experiment been performed?

A weak, single photon, source is controlled by a fast shutter and directs photons toward a double-slit. Quite far beyond the slits, compared to shutter speed, is the photon detector (perhaps a film). ...
3
votes
2answers
5k views

How is the width of a slit related to the intensity of light passing through it?

Here's a question I got in my final exam this morning. "If in a Young's double slit experiment setup, the ratio of intensity of the bright spot to the dark spot is 25:9, what is the ratio of the width ...
8
votes
1answer
2k views

How does one detect a single photon?

I understand the double slit experiment up until the point that we begin "detecting" single photons. What does it mean to detect. You cant place a camera in the slit because that would capture the ...
1
vote
1answer
310 views

Delayed Choice Quantum Eraser [duplicate]

All delayed choice quantum eraser experiments I've seen record the signal photons reaching detector D0 and then use the data of the idler photons recorded at detectors D1, D2, D3, D4 to "filter out" ...
1
vote
1answer
245 views

Possible Answer To The Double-Slit Experiment [closed]

I think I might have figured the double-slit experiment out. I am not going to explain it here, Google it if you don't know it. If I am wrong please tell me why: Matter are relative to observers ...
0
votes
1answer
74 views

Light Lab Misunderstanding. Please help

For a Physics lab, this question was asked "As you learned, the wavelength and the separation of the sources affect the number of nodal lines produced. Using your results from steps 2 and 3, determine ...
18
votes
1answer
258 views

How would a black hole behave in a double slit experiment?

Theoretically we can convert a body into black hole by compressing its mass below some radius (known as Schwarzschild Radius). Suppose such object after becoming black hole has a radius which is ...
5
votes
2answers
273 views

A modified version of the famous double-slit experiment

As far as I know, all the double slit experiments that were performed uses a light source (or electron source...) that emits photons at a "perpendicular" angle as this image shows: (will call it ...
3
votes
2answers
130 views

Double slit experiment and “space”

I'm no Physicist, so please excuse my ignorance. I'm sure there will be plenty of scenarios in which what I am about to say comes crashing down, but that's why I'm asking the question really. In ...
5
votes
4answers
2k views

What does observation mean in two-slit electron diffraction experiment? [duplicate]

My question is clear, that I ask: What do we mean by "observation" in 2-slit experiment for electrons (or any other wave-particle)? You know, we say that :"if we observe the electron, it shows a ...
1
vote
1answer
89 views

Double slit experiment query

Seen as thought empty space in a vacuum is not empty is it not possible that the gluon fields that remain affect the trajetory of an electron when carrying out the double slit experiment affecting the ...
0
votes
1answer
99 views

Double slit experiment: interaction with the environment

In order to recover the well-known interference pattern in the double slit experiment with massive electrons, one has to perform it in a vacuo. This is because, as far as I know, the interaction with ...
4
votes
3answers
2k views

Why is Wheelers Delayed Choice Experiment Incorrect?

I have come across 'Wheelers Delayed Choice Experiment' which tries to prove that you can work out which Slit a Photon Goes Through in the Double Slit Experiment. But I thought it was impossible to ...
0
votes
1answer
48 views

Electron interference and light interference

In the double slit experiment I see that shooting electrons one by one after long time create a pattern that resembles that of light interference, but before these long time I see electrons at ...
1
vote
1answer
82 views

Using tracking detector in a double slit experiment, what would we see?

Let's say we put tracking detector (eg. a cloud chamber or a more advanced device) behind the double slits. What would we see? I think the interference pattern is three dimensional. So there are ...
0
votes
1answer
226 views

References for experimental results of the double-slit experiment

Every other popular science book and intro level text on QM starts with the double slit experiment. It is always just stated as a fact that experiments have been done, actual data is never presented ...
6
votes
3answers
429 views

Double Slit Information Destruction

In the double slit experiment, when a detector is added to tell which hole the photon went through the interference pattern disappears. Would there be an interference pattern if the data was sent to ...
4
votes
2answers
209 views

In the double slit experiment, what happens when there is more than one observer trying to see which slit the same electron goes through?

From all the demonstrations Iv been able to find of Heisenberg's double slit experiment, whenever an observer tries to "see" which slit an electron passes through it collapses the wave function. My ...
1
vote
2answers
81 views

Few questions about double slit experiement

How fast does the electron move in the experiment? If the electron moved nearly the speed of light and without any other forces, it must move in the straight line because Newton's first law of motion. ...
0
votes
0answers
143 views

How can Young's double slit experiment explain the wave nature of light?

I've been reading about wave theory of light and the famous experiment performed by Thomas Young. But how does this experiment prove that light is a wave ?
0
votes
1answer
70 views

Does the equation for a wave passing through two slits apply for particles as waves?

The standard equation for a wave travelling through a double-slit apparatus is $w=\dfrac{z\lambda}{d}$, where $w$ is the fringe spacing at the detector screen on the other side of the slits, $z$ is ...
1
vote
1answer
969 views

Energy Dispersion in Young's Double Slit Experiment

In Young's double slit experiment, when you see the diffraction pattern, why does the intensity of the light fade out as you move from the central maximum? I think it has something to do with the ...
0
votes
1answer
89 views

Quantum wave interference in 3d space

Why, in the double slit experiment, is there an interference pattern only along the horizontal axis and not along both axes?
1
vote
0answers
239 views

Can the diffraction/interference pattern behind the slit (double slit) be calculated with Feynman path integrals (QED)?

I often see Feynman path integrals explained by a graphic which shows the slit and then the electron goes all possible ways behind the slit. Ok that is nice to understand the Feynman path integral, ...
4
votes
3answers
424 views

Double-Slit Experiment Separation Between Fringes

I was taught in class that the double slit diffraction pattern would always have bright fringes of same length. We derived the formula: $y=m(\lambda)(L)/d$, which also shows this equal distance. I ...
0
votes
2answers
87 views

Particle wave duality question: 2 different detectors observing different properties?

I hear a lot of people saying an observation of the double slit experiement collapses the wave function and doesn't allow you to view the particle in 2 places at the same time or as both wave and ...
0
votes
2answers
100 views

Double Slit Experiment with a slanted slit

If you consider the dark spots on the pattern produced by the double slit experiment to maybe be a shadow of the slitless area of the dividing wall between and around the slits, as silly a thought as ...
4
votes
4answers
2k views

Does the observer or the camera collapse the wave function in the double slit experiment?

Ok so if we setup a camera before the slit we will find a single photon and will follow through accordingly, likewise by having a camera setup after the slit, we can retroactivly collapse the wave ...
3
votes
2answers
183 views

Copenhagen interpretation

Reading some science history, Werner Heisenberg and Bohr created the Copenhagen interpretation, but what I didn't get is how can we connect this interpretation to Schroedinger's cat and the double ...
3
votes
2answers
242 views

Shooting a single photon through a double slit

Consider the image below. It shows a double slit experiment but with a single photon at a time. My question is as follows: Why is it that the photons always take a different path when shot at the ...
7
votes
2answers
720 views

Has the collapse of wave function due to observation been recorded?

I've seen pictures like this one, which depict the outcome of the Double-slit experiment with wave-like or particle features, depending how measurement has taken place. The graphic showing ...
0
votes
2answers
75 views

Can an experiment be designed to distinguish between actual wave interference and probability or pilot wave results?

I am a physics groupie, so please excuse me if this question is stupid, but I am trying to better understand the particle/wave duality in quantum physics. It would seem that, in the double slit ...
0
votes
3answers
68 views

Can we make a camera that fits in one of the bands of the double slit experiment?

So, in Young's double slit experiment, we see where the particle lands on the back wall. What if we were standing at the back wall, looking toward the slits? Could we gain more information not by ...
1
vote
1answer
136 views

Double slit experiment from first principles of QM

I have read many descriptions of electron double slit experiment but I could not find the description from the first principles of quantum mechanics. Most of the descriptions makes comparison with ...
7
votes
2answers
667 views

How do electrons interact if one of them had just exited the two slits of the double-slit experiment?

Consider the following experiment: a double-slit set-up for firing electrons one at a time. Let's now add a second electron (orange), which is fired parallel to the first one, but in the opposite ...
1
vote
3answers
509 views

Experiment demonstrating interference patterns of neutrons

The question is about experiments (and references) that demonstrate interference patterns of neutral (chargless) particles (fermions), especially neutrons. Like double-slit experiments for neutrons ...
3
votes
2answers
1k views

How do photon emitters and photon detectors work?

The interpretation of the double slit experiment is very strange and i want to understand how they did it before I give up my concept of reality. With the double slit experiment a interference pattern ...
3
votes
2answers
87 views

2-slit experiment

In the 2-slit experiment, is it possible to "account" for all of the energy in the incoming beam - i.e. does all of the incoming energy show up in the bright spots or is some of it "destroyed" when ...