Double slit Definition and 802 Threads

Hi can any point me to a site/paper on how to construct the equipment required for the electron double slit experiment ? Thanks Lachlan

I'd like to know a few things: Are there different explanations of this experiment, and if so – which are the most common? What are the different implications and how much do we understand about it today? __________ I don't know much about quantum physics, but I'd like to learn and since I'm...

I'm sorry if this has already been completed or already discussed. If so, just link me to answer the question, thanks. What if we conduct a double slit experiment with two observers? We use a detector to see which slit the electron passes through. Observer A receives results that the...

I took a piece of carton and cut out to strands in it. When I shine the line through it, it only projects the two strands on the other side. I tried it with every light in my house but it still didn't work. what do I have to do, to create the wave interference pattern on the other side. Thank you

in the experiement does the electron/photon always split and physically go through both slits or is this just an interpretation of the results? I believe this is Feynmans interpretation. is it universally accepted?

Why the central fringe in the double slit experiment is brighter than the others? I've tried but I still cannot undersand this. Can somone try to explain it to me. I don't know too much in modern physics, please be patient :) thanks for any help

Homework Statement A double-slit interference experiment is done in a ripple tank (a water tank using a vibrating rod to produce a plane wave on the surface of the water). The slits are 6.00 cm apart, and a viewing screen is 2.15 m from the slits. The wave speed of the ripples in water is...

Homework Statement 605-nm light passes through a pair of slits and creates an interference pattern on a screen 2.0 m behind the slits. The slits are separated by 0.120 mm and each slit is 0.040 mm wide. How many constructive interference fringes are formed on the screen? (Many of these fringes...

I am trying to prove that the two θ are equal from this picture http://en.wikipedia.org/wiki/File:Double_slit.svg How do I go about proving this?

Hello all, I have been reading about quantum entanglement on this webpage. It builds up to the quantum eraser where two entangled photons are produced using a BBO crystal, that have opposite polarity, with one going through a double slit to a detector and the other going to another detector...

I understand that in the Double Slit Experiment that the particle will only go through one slit if it is measured or observed. But will the particle only go through the slit observed or is it 50/50? Also any other info on the experiment that might help me or even just interest me? Any articles I...

Homework Statement Laser light of wavelength λ is incident onto a pair of narrow slits of width a and spacing dWrite down an expression for the intensity as a function of angle of the angle measured from the central axis, θ, in the far-*‐fieldHomework Equations The Attempt at a Solution I...

If electrons are shot through the double slit one at a time, is it observed that each electron hits randomly in one of the dense areas of an interference pattern, or is it only observed after a long time that the interference pattern emerges? To rephrase, what I'm asking is whether a single...

Homework Statement Can wave-like behaviour, eg interference or diffraction, be observed with the following? Electrons with a velocity of 20 m/s passing through a double slit with a separation of 2nmHomework Equations The Attempt at a Solution The solution is given in the book. λ = 2.65 x...

I was thinking about this. Setup a Young's double slit experiment as follows. Single Photon Source /Pulsed Photon source -> Single Slit-> Mask with two Slits (Slit 1 and Slit 2 )-> Detection plane consisting of many single photon counters. I am assuming it's possible to detect the...

Hello. I have been studying interference and diffraction and one doubt has appeared. When you consider the double slit experiment forgeting the effects of diffraction you get the following equation for intensity I^{}=4I_{0}cos^{2}(\frac{πdsin(θ)}{λ}) where d is the distance between the...

Homework Statement Suppose we wish to do a double slit experiment with a beam of the smoke particles of Example 4.1c (which is lamda=6.6e-20m). Assume we can construct a double slit whose separation is about the same size of the particles. Estimate the separation between the fringes if the...

Hi guys, Please excuse me, I do not know a great deal about Quantum physics. First, tell me if I am correct. If we shoot electrons at a double slit plate, and we do not watch or "observe" it, it will show a pattern similar to a wave pattern. But, if we record it, or observe it, it will...

Hello, my name is Jordan Heath. I am a UBC third year student in the department of physics and am new to this forum. Me and a couple friends are looking into the possibility of constructing the double slit experiment and are currently wondering if it is possible to salvage a pair of CRT's from...

Homework Statement The interference pattern formed is given by I(θ)=4I0cos2(∏dsin(θ)/λ). For d=1×10-5m and λ=500nm plot the intensity pattern as a function of θ for small θ. How would this change if a block of material of thickness 500nm and refractive index n=1.5 were placed over one slit...

The usual interpretation of the double slit experiment, when done with a single photon at a time, is that the photon must interfere with itself. However interference cannot be measured in a single-photon experiment - it requires a large number of photons to manifest a discernible interference...

Imagine a light source, double-slit, and a curved screen in vacuum, shaped so that all parts of the interference pattern are created simultaneously. Define distance as proportional to the time light requires to reach a point. Detectors at each slit can be operating or not. Call the source S...

Hello Lets make a few double slit experiments. Lets say we have water pond with a set of point size emitters on the left and a set of independent wave energy detectors on the right side. http://img560.imageshack.us/img560/571/slits1.png Now let each point emitter emits wave but with big...

For my AP Physics course, I am trying to replicate the double slit experiment. My idea is to have a cathode ray tube from an old television set and take the electron gun out. The electron gun will be firing at a plastic or foil sheet with 2 narrow slits side-by-side. Behind the screen, I will...

In short the question I am trying to answer is: 1. do the "waves-functions" from separate particle interfere? 2. do the Schrodinger equations predict the interference pattern caused by the interference of the "wave functions" of two separate particles? The above question is...

Parallel laser light with wavelength 633 nm are incident perpendicular against a double slit. 2.50 m behind the double slit is a screen where the pattern can be seen (link below). Determine with the help of the figure the slit-with and slit-distance...

Hi all, I was studying Stephen Hawking's new book (very good, by the way). He was explainning Feymann's theory, that says a particle travels by all the ways possible to reach a given point. So single particles CAN have interference by themselves. Then he explain why, in the double slit...

Hey Guys, I continue to get mixed messages about the nature of electron behaviour during the double slit experiment. I have heard the term observation used to describe an interaction with the electron (Obviously necessitating a change in it's behaviour to facilitate the ballistic outcome)...

Just a thought. In the double slit experiment, is it possible that the particles don't actually interfere with themselves, but rather they encounter interference from all the other particles which either already have been, or subsequently will be sent through the experiment. After all, for the...

Is double slit experiment the only proof for quantum particles' superposition??

can someone tell me the relation between the intensities (of a bright band and a dark band) and the amplitudes of the interfering waves ?

In the double-slit experiment, without which-path information available, the diffraction pattern is usually shown as an even function with respect to the displacement from the midpoint of the slits: something like sin ay / y. (This is the case in Feynman's lectures, and many others.) The...

This is seriously the most amazing thing ever. Pretty cheesy experiment, but amazing results. It still makes no sense to me how an observer completely changes the outcome. Its like the electron has a mind!

Is it safe to conclude from the double slit experiment that the observer actually affects what is being observed? I ask with regards to a project I'm writing which I wish to be scientifically accurate.

Hi, Have there been done variations of double slit experiment, particularly I'm interested in following scenarios: 1. Three slits instead of 2. (Would expect the same behaviour of wave interference) 2. An observer is installed at one of the three slits. (Again, wave interference should be...

Homework Statement Is this wrong or right? PLZ.The Attempt at a Solution http://www.kentshillphysics.net/optics36.gif I have a test tomorrow buy my teacher said it's m - 1/2 Why does it say n + 1/2 everywhere. >_<

I just saw a video explanation about the double slit experiment , and how an electron behaves as wave / particle according to if it is observed or not. I am more intrigued to see in action how an electron will behave as a particle when consciously observed and as a wave function when it is...

Hi guys, Was trying out a home made double slit experiment as I've seen on youtube with a laser pointer and 2 pieces of pencil lead. Then I realized that I can obtain the same interference pattern with the single pencil lead. Is this equivalent to a double slit interference?

I'm becoming more and more convinced that light isn't the only particle that can interfere with itself, and that the behavior may instead be a function of a particle's level of interaction. The multi-galaxy collision we witnessed not long ago may have been the first time we've had the scale...

I've read in many places that if, in a Young's double slit experiment, you can determine by whatever method through which slit your photon goes through (enhancing the "particle" behavior of light), then the interference pattern dissapears. For this reason Zeilinger says that entangled photons...

I noticed a youtube video, where Thomas Warren Campbell, a physicist and author of the book trilogy My big TOE the last standing for Theory of Everything and apparently he also works for NASA, deducts some very disturbing things from a certain double slit experiment. Here it is, I marked the...

This is more a conceptual question, but after watching several videos about Quantum Mechanics, I noticed a little discrepancy about an explanation of the double slit experiment and it's implications. According to one video, the electron fired traveled through both slits at the "same time as...

In viewing a derivation of the formula describing the intensity of the interfering waves, I noticed how the electric field components were combined - one from slit a, the other from slit b. The intensity is then proportional to the square of this value. But this would mean that two in phase...

Today, my teacher showed us a video in class (AP physics B) as part of our quantum physics unit. I'm really skeptical about the video, and I wanted to seek the opinion of people who are actually knowledgeable in this field. Is there anything wrong with the information provided...

Hello everybody, I am absolutely a novice in physics and although I generally have a good grasp of math I am pretty sure my knowledge of it is quite far from the one required by quantum physics. However, I am very interested to its main concepts and for this reason I am reading an...

I was recently studying Feynman's sum-over-histories approach to quantum probability. I also was reading an interesting paper on the double slit experiment. How do these two work together. Do some of the probability waves not have a out of phase partner to interfere with itself? On a related...

Homework Statement The more I think about path difference, the more confused I get. First of all, HOW DO PEOPLE know that the path difference is dsinθ? Why do we draw a line coming from the first ray that is PERPENDICULAR to the second ray when determining path difference? Please see...

Hi all, My limited knowledge of quantum decoherence leads me to believe that it can be demonstrated experimentally via rather humble apparatus involving low power lightbulbs, a few sensors, & some plywood with holes in & some switches etc. I was just wondering what kind of pattern you get if...

Greetings! From my last post, to this my understanding of QM has improved somewhat. (thanks mostly to these great forums). I was wondering how the Multi Universe Theory treats the observer effect in a basic Quantum Double Slit Experiment ? from howstuffworks.com :- "“When a...

I know even molecules can be used and the result still emerges. What is the density of [pick a type] of atoms or molecules when the experiment stops working? Also, as you increase the density of whatever you're using, does the result get less and less like what you get when you use photons...