Double-slit Definition and 185 Threads

Can someone supply me with a link to a good article or book, or anything, that gives details on the type of detector that determines "which way" in experiments where the double-slit interference pattern is cancelled? DC

Is this right about the double-slit experiment and quantum physics?? Well I'm trying to understand the double-slit experiment (and quantum mechanics), so could you tell me if this is correct? A photon is fired through two slits at a plate behind the slits. As long as it isn't observed it...

Homework Statement In a double slit-experiment, how far apart do the path length differences have to be to get a pattern with adjacent constructive and destructive interference fringes? I have no clue how to even begin this problem.

Homework Statement Would it be possible to do a double-slit experiment for water waves? Can you observe wave interference in the turtle pond on campus? Homework Equations The Attempt at a Solution I feel that since water waves are in fact waves, they can no doubt interfere with...

Is it even possible to do so? I used a thick paper sheet with 1x5 mm slits 5mm apart with a normal flashlight (just to do a rough test). I saw what looked like the patches of light with darkness in between, but it was very, very faint.. Is it possible to do an effective model with easy-to-get...

Homework Statement In a Young's double-slit experiment, two rays of monochromatic light emerge from the slits and meet at a point on a distant screen, as in the figure below. The point on the screen where these two rays meet is the eighth-order bright fringe. The difference in the distances...

Homework Statement A double-slit interference pattern is created by two narrow slits spaced 0.21mm apart. The distance between the first and the fifth minimum on a screen 60cm behind the slits is 6.2mm. What is the wavelength of the light used in this experiment? Homework Equations...

So, I recently read "Divining Light" by Ted Kosmatka. In it, he proposes a thought experiment (acted out in full by his characters) in which the double-slit experiment with electrons is performed. The detectors at each slit are wired to a computer, and do not click or turn on a light, merely...

Hello, I am not educated in physics, but I would like to gain some understanding on the double-slit experiment. I am suspecting that not only its results are to me hardly understandable (as far as I know, that is the normal case), but also some of the assumptions on which the experiment...

Homework Statement A very thin sheet of plastic (n=1.70) covers one slit of a double-slit apparatus illuminated by 630 nm light. The center point on the screen, instead of being a maximum, is dark. What is the (minimum) thickness of the plastic? Homework Equations Constructive...

Not sure whether to put this in the QM forum or the classical forum, you'll see why-- I was thinking about the http://grad.physics.sunysb.edu/~amarch/ version of the double slit experiment, in which the information about which slit the particle went through is obtained in a somewhat unusual...

Homework Statement Find the de Broglie wavelength for an electron with v=0.001c. Find the angular width of the central bright fringe in a double slit experiment, with the separation of the two slits d=50nm. Homework Equations wavelength = h/mv d sin(theta)=n*wavelength The...

How exactly do physicists detect if a particle goes through one slit or the other in the double-slit experiment? Every book and article I read seems to elude this part.

Homework Statement In a double-slit experiment, He-Ne laser light of wavelength 633 nm produced an interference pattern on a screen placed at some distance from the slits. When one of the slits was covered with a thin glass slide of thickness 12.0 um, the central fringe shifted to the point...

I was thinking about the time reversal explanation of the double slit experiment, where the anti-wave-particle goes back in time and interferes with the wave-particle that we observed hit the target. Since we don't actually observe this phantom particle that is traveling back in time (and...

If you didn't know if the "observation" tool was on or off, could you tell if a single electron had been "observed?" Does wavefunction collapse influence the electron in any measurable way? (Besides the built-up detections on the screen.)

In the double slit experiment, a wave is forced to go through a tiny slit. I do not understand what is stopping it from going through the barrier. After all, we can think of an electromagnetic wave as just the electric/magnetic fields of a sinusoidally oscillating particle, evaluated using...

Homework Statement A beam of electrons is accelerated from rest and then passes through a pair of identical thin slits that are 2 nm apart. You observe the first double-slit interference dark fringes occurring at ±20◦ from the original direction of the beam when viewed on a distant screen. (A)...

Homework Statement What is the maximum order number possible for red light (630 nm) illuminating a double slit with separation 3.0 x 10^5 m. Texbook answer: 4.76 x 10^11 Homework Equations mλ = d*sinθ mλ = d*x/L The Attempt at a Solution So λ = 630 nm or 6.30 x 10^-7 m, and d =...

Hi all, these questions have nagged me for years and I have never found a text or a paper that even addresses them. Regarding photon "radius", what is the maximum width that two slits can be spaced which still permits the double-slit phenomenon to occur? Would this be a valid method of...

I have read that some universities with strong physics programs have equipment setup for the double-slit experiment in order to occasionally demonstrate to undergraduates and for experimental purposes. Does anyone know which universities these might be in the US and Europe?

Hi, I am not sure if this kind of experiment has been performed before. If so, great, I would love to see the results. Anyway, here goes. The double-slit experiments with photons, electrons and even...

In regards to the double-slit experiment, where two waves cancel each other out (causing destructive interference), does that cancel out the particle too? I would assume all particles would form the light areas of the interference pattern. Just don't understand how the light/dark bands are...

This isn't really homework so please let me know if I've posted this in the wrong place. We've been given the task of carrying out an experiment on pretty much any topic. I've chosen young's double slit experiment to show that light has wave-like properties, and I'm also going to use the...

Hello guys I was a confused by this part of the Wiki article on "Double-slit experiment": It seems like all the (popular physics) accounts I'm familiar with go out of their way to endorse exactly the point in question. Is the author of the wiki article trying to impress that "detection" is...

If, in the double-slit experiment, individual photons only interfere with themselves, as apparently happens when the stream of photons is slowed down to "one at a time", does the same rule or phenomenon apply to the various Michelson interferometer experiments? I think it was in Dirac’s...

Who did and when, the first double-slit experiment using single electrons? (no wikipedia reference please...)

From a recent double-slit thread: Thank you for mentioning those papers! (Probably, I didn't notice the earlier mentions because I hardly ever read the endless "double-slit" threads. :-) The Fourier transform method occurred to me a while back as possibly a better way of deriving this...

Hello; In classical physics, measurement does not play a major role, but in quantum physics measurement plays an active role, correct? In the double-slit experiment, whether or not the path of the particle is measured - a detector finds which slit it passes through. I'm not questioning why...

Okay so we have a series of electrons going through the famous 2 slits and the wave-nature of the electron causes an interference pattern to emerge on the back plate. So far so good. But now we put a detector behind slit-A and the interference pattern goes away. Now I have 2 questions. 1)...

Homework Statement In Young's double-slit interference experiment with light of wavelength \lambda, two light waves come from the slits and are superposed at the point P on the screen. These waves have the following forms: E1 = E0 sin(wt + π/4) E2 = E0 sin(wt + Φ) Find the possible...

Hi, not sure if this is the right section, but I'll post this here anyway. I'm after some specific details of the famous double slit experiment with electrons: 1. How wide are the slits? 2. How far apart are the slits? 3. What is the barrier (i.e. around the slit) made of? 4. How can we...

In the following I am always talking about fraunhoffer diffraction suppose you have two slits in a doulbe slit diffraction experiment which are both exposed to the same plane wave (say the same laser) as the original source of radiation. Usually, we expect that both slits will act as EQUAL...

In the case of the double-slit experiment using electrons, what kind of interference pattern is created? Characteristic to transverse or longitudinal waves? Can we tell only analyzing the interference pattern what type of waves created it? Thanks!

Will a double-slit experiment work (exhibit an interference pattern) with a source of photons that is just monochromatic or do the photons need to be in the same quantum state? More generally, do all properties of a source of quantum particles need to be identical in order for the double-slit...

...The superposition of two states?... When I send a massive, classical chunk of carbonous stuff through a double slit, you can't expect me to believe that that chunk will magically turn into two equally massive chunks and do its constructive/destructive interfering, yet this is exactly what...

I've been looking over an old exam for one of my classes, and cannot decipher the train of thought used in solving (or method used) the problem on the last page: http://people.physics.tamu.edu/kochar/FE/FE_Fall05_1.pdf Specifically, for the first part, what is going on...? Firstly, I have...

Hi. I'd like to talk about the double-slit experiment performed with electrons. We know that any device, used to tell us which slit the electron passed through, destroy the interference pattern that we would observe if we used no devices. Well, but what does it happen if we don't receive the...

Homework Statement It should be obvious that the simple interference of two waves is not the only that you have seen with the double slit. What other phenomenon is altering your pattern? Homework Equations The Attempt at a Solution I'm assuming that the intensity of the light of...

Were there any attempts to setup double/single slit experiment inside a gas chamber, bubble chamber or similar, so that particle trajectories would leave visible trails? This seem to be the easiest way to figure out what exactly is going on, but internet search returned no result about any such...

Consider the following double-slit experiment: The source is an optical laser. The beam is, say, ½-inch wide and the laser is located far enough, say 10 yards, from the 2 slits to guarantee a large uncertainty in position (because of the very small uncertainty in the momentum direction)...

If you fire electrons, one after the other, at a double-slit, and let them hit a wall, you get light and dark bands. If you shine a light on the electrons as they pass through the double-slit to find out which of the paths they took, there's no interference pattern, just two piles. That's...

Here's my puzzle... Electrons through a single slit one at time - standard distribution Electrons through a double slit one at a time - interference pattern Set up a detector to observe which slit the electrons passed through - back to a standard distribution. This is all well and good...

Homework Statement I was just wondering in double-slit interference, when it's a bright fringe, let's say m=2, does that mean that one wave coming from one of the slits is traveling 2 wavelengths longer than than the other wavelength coming from the other slit? How does that work? Thanks...

Hi, I was wondering if anybody could help me understand a derivation connected to the double-slit experiment that I came across within an introduction to quantum theory paper. I was interested in understanding this approach because it seems to provide a useful correlation of the meaning of the...

Considering the double-slit-experiment version whereby only one electron is fired at once, and a measuring device is placed by one of the slits, which can determine through which slit te electron travels. My question would be: Which case is sufficient to qualify as an observation that will...

Homework Statement A sheet of plastic, n=1.6, covers the entrance of one slit of a double-slit. When the double-slit is illuminated by monochromatic light with wavelength = 586 nm, the center of the screen on the other side of the double-slit appears dark rather than light. What is the...

Homework Statement With regard to Young's double slit experiment, locate the position above the central axis of the 3rd bright fringe for light of wavelength 500nm incident on slits separated by 0.1mm, when a thin (0.001mm) parallel sheet of glass of index 1.4 is placed in front of the slits...

Homework Statement http://img225.imageshack.us/img225/3118/photo1587hx4.jpg This #74 is on the SAT Practice Subject Test in Physics, which is also the Physics test administered in January 2003. Homework Equations I don't even know how to begin this problem. The Attempt at a...

Homework Statement I did part A & B and got the right answer. Question C is "Is the separation the same for all maxima?" Homework Equations \sin \theta = m\lambda /d The Attempt at a Solution In the homework problem, sin theta can be computed with y/D, where is the separation of...