Slit Definition and 1000 Threads

It seems physicists have come to the conclusion that a single electron travels through both slits at the same time, otherwise there wouldn't be an interference pattern when only one electron is being sent through the apparatus. Apparently this experiment has been done in real life. You can't...

1. The photograph shows the interference pattern produced when monochromatic light falls on a pair of slits. I cannot post links yet but the photo is of a typical fringe pattern produced by coherent light waves from a double slit. Mark with an X on the photograph the fringe or fringes...

Is it true that particles behave like waves when there is no observer but behave like particles when there is an observer? If so, how does the observer impact the behavior of the particles? Do electromagnetic waves play a role? Any insight would be appreciated.

hey everybody, I am doing a physics project on the double slit experiment. (I know all the physics and math behind it so don't get into that stuff :P) I was just wondering if people had any suggestions on how to conduct the experiment, I was thinking of cutting two extremely small (knife blade)...

1. In a typical set up of Young's Double Slit experiment, if the widths of the slits are assumed to be infinitely small and 'y' is the distance from the central maxima on the screen, sketch a clearly labelled graph to show the variation of the intensity of the fringe pattern with 'y'. The...

Hi I would really appreciate if someone could answer what maybe a really simple question. I'm no physics expert but I do read a lot and I have a keen interest. My question is related to light interference and the double slit experiment. I know that by observing which slit a photon of...

This might sound very basic but... when the electron passes through the two slits and we see the 'pretty' interference pattern on the opposite side what causes the dark fringes to be seen, how does an electron, after acting as a wave and then as an electron when it is recieved, interfere with...

Homework Statement http://img141.imageshack.us/img141/1395/40941671kx8.jpg http://img141.imageshack.us/img141/982/82443157pt9.jpg Homework Equations http://img85.imageshack.us/img85/4523/60192566ie7.jpg The Attempt at a Solution I'm not sure where to start with this one. I've...

Width of Slit...HeLP on setup Please! Homework Statement A helium-neon laser (λ=590 nm) illuminates a single slit and is observed on a screen 1.7 m behind the slit. The distance between the first and second minima in the diffraction pattern is 6.78 mm. What is the width (in mm) of the slit...

1. With light from a gaseous discharge tube incident normally on a grating with slit separation 2.23 μm, sharp maxima for a certain wavelength of light are produced at angles θ = -17.1° and +17.1°. Compute the wavelength of the light in nanometers. 2. I thought this would work...

Hi, I have a physics assignment which is asking me what the fringe pattern would look like if white light was passed through a double slit. Would it look like a single light which became gradually darker the further away it got from the central maximum? Thanks in advance Richard.

Today in class we went over the single slit experiment, the aim of the lesson was to see that the greater the diffraction angle the lower the intensity. We then looked at a graph where it showed along the x-axis the angle of diffraction and up the y-axis the intensity. There was a decrease in...

hi everybody. I have a problem in finding the width of central maximum in a single slit diffraction pattern. theoritically, we say it is the distance between the two first minima on either sides of the central maxima. i feel this calculation leads to the width of central maxima+half minima on...

Homework Statement An air rifle is used to shoot 1.0-g particles at 100 m/s through a hole of diameter 2.0 mm. How far from the rifle must an observer be to see the beam spread by 1.0 cm because of the uncertainty principle? Compare this answer with the diameter of the Universe (2x10^26 m)...

My apologies - you are all probably bored to death with these kind of naive questions - but I'd appreciate an answer if someone knows a definite answer. I'm thinking about the original double slit experiment - We fire one particle at a time at two slits and, as long as we don't detect which...

I am stuck on a question regarding Young's Double Slit Experiment. The two beams in Young's double slit experiment must (a) be parallel (b) have equal intensity (c) come from the same source (d) traverse equal distancesHere are my reasons for my answers. I may be misinterpreting certain parts...

While researching the double slit experiment and finding that even when only one photon is fired at a time and interference still occurs (so the photon must be traveling through both slits at once) i came up with a possible problem with the theory and wondered if anyone could help me see where...

Homework Statement I am taking Young's Double slit expariment setup, however now I am changing the polarization. Below is the typical intensity when both slits have the same polarization, what I need to know is how the intensity graph changes when there is a difference of 90º and 180º in the...

can u suggest a good site for studying young's double slit experiment involving interference of light coming from two coherent sources online?

Homework Statement A laser with wavelength d/8 is shining light on a double slit with slit separation d. This results in an interference pattern on a screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, through the same slits. What is the...

Homework Statement Interesting Problem... monochromatic light of wavelength \lambda falls on a slit and is transmitted as t=1 for 0<x<(d/2) t=-1 for (-d/2)<x<0 t=0 otherwise... Define \ w =\ k(d/2) \sin\theta...[most possibly,if I can exactly remember...] Now what should be the...

Light of wavelenght 630nm passes through a single slit. The angular deflection to the tenth dark band on the side of the center maximum is 3.6 degrees. A) Calculate the slit width. B) Calculate the angular deflection to the tenth dark band using light of 450 nm wavelenght. Relevent Equations...

Homework Statement Using a conventional two-slit apparatus with light of wavelength 540 nm, 33 bright fringes per centimeter are observed on a screen 3.8 m away. What is the slit separation? Homework Equations m/x = (2*theta)/wavelength = number of fringes per meter interence maxima...

urgent Help with single slit diffraction (fraunhoffer) why is it a minimum at a*sin (\theta) = m*\lambda, a = slit separation I would have thought if the path difference is equal to a whole wavelength then there would be constructive interference?? See...

Why( and how) does the intensity of the wave vary along a screen perpendicular to the optical axis?

Hi there! I'm currently sat in the lab working on one of my uni assignments (I'm in my second year at Exeter, UK), and I'm getting results that I just don't understand, so thought that someone here might know what's going on! :smile: We're using a laser (through two lenses: I think one's...

A double-slit experiment is set up using a helium-neon laser (lambda =633nm) . Then a very thin piece of glass ( n=1.50 ) is placed over one of the slits. Afterward, the central point on the screen is occupied by what had been the m = 15.0 dark fringe. How thick is the glass? I really need...

An Alternative Model of the Double Slit Interference Experiment W.H. Madden November 20, 2007 ABSTRACT This post presents an alternative model of the double-slit interference (DSI) experiment. The model is based on a novel physical interpretation of the concept of the DeBroglie...

[SOLVED] Double slit equations In an experiment, blue light with a wavelength of 645 nm is shone through a double-slit and lands on a screen that is located 1.35 m from the slits. If the distance from the centre maximum to the 8th order bright fringe is 2.6 cm, calculate the distance between...

Q.Suppose that the the light rays in young's Double Slit experiment fall at an angle \theta=\sin^{-1}(\frac{\lambda}{2d}) .Then prove that the the Point P which is the symmetric point on screen between two slits is the centre of central minimum Necessary Formulaes for minima the waves...

So I've been thinking about the slit experiment again... I did some googling/searching for literature but was unsuccessfull for finding the following variations on this subject. What happens when the slits are very long? (very thick sheet) What is the material (Z) dependence? What...

i was going through the standard proof of Young's experiment using electric field concept .what the proof did is took two source S_{1} and S_{2} in the same line(asuuming such points do exist) and took a point P in the same plane as those points and found out the field at the point . 1.Was this...

Double split creates a wave interference pattern. Closing up one slit creates a particle like pattern (all hitting one spot). Does the closing up of one slit (allowing the particle to go through in only one narrow spot) measure its position (by the powers of Heisenburg Uncertainty Principle)...

Homework Statement A single electron with de Broglie wavelength λ passes through a slit of width d=2λ.The electron can strike a fluorescent screen.What will be observed on the screen? (a)a diffraction pattern (b)a single flash as if the electron had moved in a straight line through the...

According to my knowledge, the position of the dark fringes is given by asin(x)=m*lamda (sorry, I do not know how to type equations in here) tan(x)=d/L a=slit width x=angle of diffraction(?) m=no. of order d=distance from the central fringe L=distance between...

for those of you that are familiar with Young's Single slit experiment, I am having trouble determining how far apart the minima are. The problem is as follows: one shines a laser with wavelength lambda=650nm through a single slit of width a=.04mm onto a screen 10m away. How far apart are the...

hey during proof of expression of double slit interference at a point ,we take into account the interference due to 2 light rays emerging from 2 different slits. here why don't we account for the the interference also due to to light rays emerging from the same slit as in the single slit...

The standard explanation for diffraction patterns from a single slit employs Huygens Principle and the production of secondary wavelets to form a new 'front'. These fronts reinforce constructively and destructively to produce the pattern. But...if you consider an infinite number of points...

Homework Statement A laser with wavelength d/8 is shining light on a double slit with slit separation 0.500 rm mm. This results in an interference pattern on a screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, through the same slits...

Could anyone explain why it is that as more slits are added the fringes appear sharper? Thanks

hi all...it is said that constructive interference happens when the path difference is nlambda and i think wavelength,frequency and amplitude of light going through both slits is the same then why is the central maxima is the brightest spot? why the brightness decreases when n increases...

Hello. Just to set things straight this is my first post here and I am also a complete nube when it comes to things this confusing. I started reading a book called "the elegant universe" by Brian Greene. So far I think the book is great but I am stumped on one part of the book. Its the part when...

I have a simple question on double slit experiment, In double slit experiment, after the light rays pass through the slits, place two beam splitters (down converters) which split the light into two rays, one going towards the screen and other going orthogonal to it. Now my question is do we get...

Homework Statement From "http://physicsweb.org/articles/world/15/9/1": In 1909 Geoffrey Ingram (G I) Taylor conducted an experiment in which he showed that even the feeblest light source - equivalent to "a candle burning at a distance slightly exceeding a mile" - could lead to...

Hello, is it possible to reproduce the double slit experiment at home with some easily obtainable equipment? I was thinking of using one of those laser pointers. Though I'm not sure how to make the slits - would cutting a pair of close lines in a piece of plastic with a sharp knife be good...

I came upon a very interesting article today: http://www.msnbc.msn.com/id/19875410/site/newsweek/ I wanted to confirm what I read... this is the first time I ever heard of this kind of thing, and I was wondering if any of you have seen this before. It talks about a tweak of Young's...

Two narrow slits of width a are separated by center-to-center distance d. Suppose that the ratio of d to a is an integer d/a=m. Show that in the diffraction patterns produced by this arrangement of slits, the mth interference maximum (corresponding to dsin(theta)=m\lambda) is suppressed because...

when performing a double slit experiment using photons it is said that if you fire individual photons that over time as more photons are fired the interference pattern starts to appear. My question is how do they define a single photon? what is the method that they can fire one photon at a time...

Hi I don't know whether this is a homework-type question or not, so I am posting it here. In young's double slit experiment the interference pattern is found to have an intensity ratio between bright and dark fringes as 9. What does this imply: (Below are the options provided in the book...

Let me start by saying this is just a problem posed to me. I had this prof before so some people thought I might could see what he was thinking. OK here is the problem two in phase sources of waves are separated by a distance of 4.00m these sources produce identical waves that have a wave...