Slit Definition and 1000 Threads

Homework Statement [/B] we used a laser pointer as a light source Homework Equations I'm having trouble looking for an error in the experiment. The Attempt at a Solution

Homework Statement Coherent light with wavelength 585 nm passes through two very narrow slits that are 0.320 mm apart. The screen is 0.700 m away from the slits. The intensity is I0 at the centre of the central maximum (theta=0) (a) What is the phase difference (in radians) in the light from...

Why is it possible to do this experiment at home and still see light as a wave? Isn't there loads of interference? Or does this have to do with wavelength? If you use a laserpen and 3 needles you can basicly do it at home without shielding off anything...

Hi all, I'd like to ask what was the first time the double- slit experiment have been made by electrons. In Brian Greene's film: It's said to be in nineteenth twentieth, while at other webpages as...

i would be interested in seeing dbl slit experiment done with different patterns. i.e. instead of slits circles or one slit one circle etc. has this been done

Hi all I can't find any guidance on this on the internet, so hopefully someone here can help! Basically, I want to work out the intensity profile produced by a multiple slit experiment, with 4 slits. No problem there, but I need the separation between slits to be unequal! I've found mention of...

I had this problem on my exam and I was pretty sure i knew what to do but it couldn't come up with the right answers. I diagrammed the problem and showed the way i tried to solve it in blue. Can someone tell me where i went wrong? Basically i found the length the of the first maximum off the...

Can we say that a point light source (turned off) together with a two slit interferometer and say a photographic plate detector exclude certain photon modes? Light does not go to certain parts of the photographic plate so can we say that the source (turned off), the interferometer, and the...

Homework Statement Young's double slit experiment 'd' - Separation between the two slits 'D' - Separation between the double slit and the screen 'S' - Source (Primary) (It is coherent) S1, S2 - Secondary sources Δx - Path difference between the two rays coming out from S1 and S2 Δx° - Path...

Are there any actual experiments that have been made where it has established if the naked eye can kill the interference pattern on the detector screen in the double slit experiment, that is, can the naked eye somehow function as a detector in this experiement? Let me give an example to clarify...

Hello all, I am just being introduced to quantum physics in my introductory physics course at university and I'm not sure I understand a couple of things...any clarification would be greatly appreciated. So, when looking at the double-slit experiment; what can be seen on the viewing screen...

Homework Statement m=maximum h=distance on the screen from the center of the pattern to the mth maximum D=distance from the central bright peak to the slits d=distance between two slits I have m=1 d(mm)=0.25mm D=2000mm h=0.5mm wavelength= 6.25E-5mm Homework Equations So I used...

In case when we don't observe the presence of an electron at either slit, there is an interference pattern, in case we do observe there is a 2 band patter, as an electron would be a particle. I understand that without an observation, the state of an electron in a superposition of all eigen...

Hi everyone, So my quantum physics teacher gave this problem to solve as homework: An experiment to watch neutron diffraction was made. The neutron wavelenght measured was 18.45 Angstroms. The double slit was created by putting a thread in the middle of a single slit. The dimensions of the...

Homework Statement i can't understand part b ii) , i assume the resolving power of eyes is constant . so when the slit separation increase , the wavelength of the light should be decreased to keep the tetha ( here , tetha = resloving power of eyes in radian )...But the book give different ideas...

Homework Statement Monochromatic light of wavelength 550nm is used to illuminate normally a narrow slit. A converging lens of focal length 50cm is used to focus the diffraction pattern onto a screen. If the separation between the first minima is 10.0mm What is the width of the slit. The ans is...

For a double slit experiemnt, the bright fringe has intensity of I, when one of the slit is covered, the intensity is 0.25I. In my opinion, the slit now become single slit, so it has area of half of the initial area, but we know that power is the product of intensity x area, by keeping the...

The double slit experiment is not known to violate any Bell inequality, and thus may have a local hidden variables description. Does Bohm-Dirac theory provide a local hidden variables description for the double slit? Are there other local hidden variables descriptions for the double slit? (If...

Homework Statement How wide is a single slit that gives its first minimum at 90°? Homework Equations øp=p(λ/a) The Attempt at a Solution Not quite sure what the answer is looking for but I'd guess I would need to solve for "a." So... 90°=(λ/a) Is there any more...

Why can we not be more precise when shooting stuff through the double slit, so that we know if it goes in the direction of one slit or the other? By the way, is there any significant difference in workings between single and double slit interference?

Homework Statement In this question, when S2 is covered with a very thin glass, the fringe move toward Y . why is it so? Homework Equations The Attempt at a Solution

Homework Statement In a Younf's double slit experiment , the intensity of light at the centre of fringe pattern is I. If one of the two identical slit is now covered , the intensity at the cnetre ANS is 0.25I. Homework Equations The Attempt at a Solution In my opinion, it should...

Homework Statement in my textbook, it states that [SIZE="3"]if the single slit together with the light source more closer to the double slit, the intensity of light form double slit increases . hence, the bright fringes of the inteference pattern would be brighter...i couldn't understand why...

Homework Statement according to my notes, if the single slit is made larger , the slit can can been as point source, where each point can produce its own set of intefrence pattern. whi is it so ? i can't understand Homework Equations The Attempt at a Solution

Hi, can smart people please assist me with understanding something: why doesn't the "final" observation at the back screen create the same kind of effect as an observation made before the particle hits the back screen? Simple term please; no PhD here. Thanks.

Hello! For some time now I have been absolutely fascinated with quantum mechanics. Unfortunately for me, I am well aware that what I know of QM comes from over-simplifications specific to educational reading material and videos where a core goal of publication was to avoid the actual...

So based on String theory, when doing a Double Slit Style Experiment when an observation is made it is a particle and when on observation is not made, it is a wave pattern. What exactly do the Interference patterns mean? Basically what I research was this... Doe it means that in the...

We all remember the animations describing the double slit experiment to the public, laying out the foundations of the mysterious quantum world. Now take the part when we try to determine which slit the electron went through. The narrator will say something like this, in a hushed voice: „And...

I just saw a video about the so called "Double Slit Experiment" () which showed that two lightbeams that are parrallel will manipulate each other just like waves in a pond would do. The slits used in this experiment were very close together but you could see them with your eye so I guess they...

Hi all, I was looking at previous exams and I saw a question with single slit diffraction. Please look at picture. So, this made me think: "Wow, I never thought single slit diffraction could be applied in 2D with one pattern horizontal and the other vertical." Then, I thought why is...

[SIZE="4"]Definition/Summary This entry describes diffraction of a wave when it passes through a single narrow slit. [SIZE="4"]Equations The far-field (Fraunhofer) diffraction pattern has a power per area (irradiance) at an angle \theta from a single slit of width d, for wavelength \lambda...

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I have a few problems understanding the double slit experience and the behavior of photos due to simple observation. I am not really looking for in depth explanation here (great if you have it) but more for links or references to read more about it. Here are some questions: 1. What does...

Just a simple question. How do we know the detector isn't messing up the double slit experiment when a single photon is shot out. When there is no detector we know the interference pattern is formed even with a single photon. If we add detector to see where the photon actually went through a...

So Yves Couder have these silicon droplets bouncing on a vibrating surface of some liquid: ...and apparently they can produce some things quantum particles do, like double slit fringe pattern trick. The question is how does that translate to 3D and would it still work? I mean, instead of...

Consider the classical double slit experiment where we are shooting electrons trough a double slit and then capture them on a photographic plate. We know that the pattern of electrons on the plate will differ depending on the state of knowledge of the observer. If he make a measurement to find...

Hi All, I am trying too undestand the slit test which shows wave-particle duality. Please correct me if I am wrong on the basic info on the test. One photon is shot out and if there is one slit it will go through the slit and make a point on the detection medium behind the slit. However if both...

I have some questions about double slit experiment. 1) Sometimes photons or electrons should bounce off the initial barrier and nothing should be detected in the plate. ¿Is this correct? i find a video saying that NOTHING is detected in the barrier, only in the plate. 2) If we put 1...

I was just wondering if anyone was aware of a good explanation or physical cause of single slit interference that doesn't involve the Huygens-Fresnel principle. To me, the principle is not very intuitive, light does not eminate from other light (as far as I know). I think I understand that the...

I'm not a physics major and I have only a minimal/mild understanding of physics at best, and I have a question. I've heard and read a lot of people say that using the phrase "observation collapses the wave function" is very misleading, and that it should more accurately be said that...

What would happen if the double slit experiment were to be undertaken using white light, and one of the slits was covered by a monochromatic filter (i.e. something which only one wavelength could pass through), and apart from this there was no detector monitoring which slit each photon was...

As far as I know Feynman was the first who told that if you would put detectors at the double slits the interference pattern would disappear, because of "knowing with path". But I think this specific experiment has never been done because a photon cannot be detected without absorption. So if...

Homework Statement For an N = 1000 slit diffraction grating, the distance from a maxima to a minima at order p is given by: \delta \theta = \frac{\lambda}{Np} The centremost ##\frac{N}{2}## slit is covered, what happens to this width? Homework Equations The Attempt at a...

If you were to take Youngs original Double Slit Experiment, with this slight variation, would you get the same results you would usually expect, i.e. an interference pattern? The variation is as follows: Instead of one source of light, there are two sources of light, positioned next to each...

Hi everyone, Lately I have been reading about the double slit experiment, I am wondering if it would be possible to recreate this experiment with visibly large objects using magnetism. The experiment I was thinking might be able to do this is as follows: There are two vertical tubes, a...

I'm wondering something about illustrations of single slit interference. I've seen them being illustrated in different ways. One way is this: and another way is this: But I don't understand how these can show the same thing? In the first picture, we have light rays that are obviously NOT...

Hello, fellow physics lovers. I am an amateur physicist and am currently teaching some fellow keen amateurs about the marvels of the quantum world. After explaining the dual nature of light and conducting a very basic example of Young's double slit experiment using a laser and a sheet of card...

Ok, so I've just started studying quantum physics with the introductory double slit experiment. I thought I had a pretty good grasp on the results of the experiment but my tutor says I don't. This is what I interpreted from the experiment: Both slits are open. We place a detector along...

Homework Statement Estimate maximum slit width of a double slit. Homework Equations The Attempt at a Solution Letting the slit width be a, The intensity profile of such a system is: I = I_0 sinc^2\left( \frac{Nkasin \theta}{2} \right) cos^2\left( \frac{kd sin\theta}{2}...

Homework Statement After a laser beam passes through two thin parallel slits, the first completely dark fringes occur at ±14.0∘ with the original direction of the beam, as viewed on a screen far from the slits. A)What is the ratio of the distance between the slits to the wavelength of the...