Double slit Definition and 825 Threads

Hi In double slit experiment our observe can change the past and in the entanglement our observe affact other particle pair. How could such a thing possible ?

Homework Statement Suppose that light is incident on a double slit apparatus, with a slit separation d at an angle of ∅ (phi) to the normal (see attached diagram). A) Derive an equation; in terms of the variables d, ∅, θ, integers m, and the wavelength λ of the incoming light; that yields the...

Homework Statement 1. From conservation of energy point of view if single and double slits, and diffraction grating had slits of same width, how should their overall light intestines compare 2. under what conditions can we consider double-slits intensities as approximately constant...

This is another one of those things that I had always assumed to have a very simple explanation. After all, I've seen so many simulations of waves interfering with each other and forming the distinctive interference pattern, and even watched the patterns emerge in actual water waves. The pattern...

Homework Statement A double slit apparatus is illuminated 730 and 558 nm wavelengths. They form a two-colored interference pattern on a measuring screen located at a distance of 2.28 m from the slits. The slit separation is 42 wavelengths of 730 nm light. (a) What order (m) intensity maximum...

I was thinking of finding a new hobby, and thought that playing around with the double slit experiment might be interesting. I was wondering how feasible it would be to set up the double slit experiment, not simply the laser and slit version shown here...

The double slit experiment shows that light is a wave, unless observed at the point where photons enter the slits. If observed there, the result of the experiment shows light as particles. What I want to know is: 1.) What instruments are used to observe the photons as it passes through the...

Homework Statement In a young's double slit experiment the slits have the same width and are separated by a distance a. an observation screen is placed at a distance L=1m from the slits at a point on the screen a distance y from the optical axis the optical path difference between the 2 waves...

I think I am on the right track in understanding QM because I am very confused :smile: Few questions: 1. Let's say electrons are emitted from the electron gun towards a slit. Do the electrons display the wave property even before passing through the slit right after leaving the electron gun or...

Homework Statement The question is regarding Young's double slit experiment. "Describe the effect, if any, on the separation and on the maximum brightness of the fringes when the following changes are made. ... ... 2) The wavelength λ is increased to 1.5λ, keeping a and D constant...

Can somebody explain to me what is the difference between double slit diffraction and double slit interference?, to me they are the same thing but my teacher says they have two different meanings, thanks.

Here is a noobie thought. We all know the double slit experiment (say for electrons) and the explanation that electrons behave like both wave and a particle. So they pass through both the slits forming the interference pattern. But I think a quanta (electron in this case) behaves like a...

In a standard 2 slit experiment setup when the interference pattern is visible - if the screen is moved forward the pattern must 'move' across the screen as the alignment of wave peaks and troughs change. I.e if we start with an intense band at the centre then move the screen forward half the...

Would someone help me to understand what would happen in this situation. w→ x→ (y)→ z Photon emitter is at point w emitting photons one at a time. Double slit is at point x. Screen is at point z. There is a detector at point y (after photon has already passed through slits) which is capable...

So I asked this question in another thread but thought the question was probably best asked here in this forum to at least understand part of the experiment. My idea follows the traditional train and platform analogy that is used in many thought experiments to explain the issue of simultaneity...

So I'm curious. When in one instance where light behaves as a wave and you get an interference pattern, and in another instance where light behaves as a particle and you don't, does the intensity of the inner most bands of light change at all? When we place a detector beside one of the slits and...

Homework Statement I need to derive the intensity distribution of the double slit experiment. Intensity as a function of the slit separation d, the distance to the screen L and the wavelength \lambda. L>>d Homework Equations The Attempt at a Solution Ok this is ridiculous but...

1. (How) Is the frequency of a photon effected after encountering a double-slit or a half silvered mirror (say in a Mach-zehnder)? 2. Are particles such as photon, electron, assumed to be entangled, at all points in time-space, with something or the other?

Hi, I`ve been reading and watching videos about the double slit experiement, and when scientist fire one electron at a time through the double slits, and the do not interfere, how does that prove that there are more dimensions and that sub atomic particles are in a superstate. How does that...

Hi Everyone I was trying to do a young's double slit experiment with green laser. The gap between the slits was d = 0.001m The distance to the screen was D =1.2m We counted from the center 10 bright fringes m = 10 The distance of the from the center bright fringe was y = 0.067...

another double slit question - noob :( Hi guys, I never officially studied physics so my knowledge on the topic is limited. My understanding of quantum physics in relation to the double slit experiment is the following: When you only observe the end result of light, it appears as if it...

Homework Statement using the formula Δy = λL/ d calculate the fringe separation (d) for the red and blue light used in the experiment Homework Equations as above The Attempt at a Solution So I rearranged the equation to read d = λL / Δy and I'm fine with the math, but I...

Hello, I'm trying to set up an experiment to measure the distance between tracks in a CD, using only 3 items. I can only use a cardboard box, a ruler, and a laser pointer, and I will be using a double slit. So I'm thinking I will cut two slits in the carboard box, place it in front of the...

Im somewhat new to modern physics, had one introductory class in my university and because it fascinated me so much, I've watched all the leonard susskind lectures on quantum mechanics, entanglement, and particle physics on youtube on the Stanford channel. Today I noticed something strange...

Homework Statement In a version of Young’s double slit experiment, the slits are separated by a distance of 1.0 mm. The light from the slits is observed on a screen that is 12 m from the slits. If the wavelength of the light is 550 nm, what is the linear distance on the screen between the...

I've been reading & watching videos about the double slit experiment, and I'm failing to see what's so interesting & strange about it (I hope someone can enlighten me on what I'm missing). The weirdness is NOT the fact that observing an electron changes it's behaviour (right?) At first I...

The Double Slit Experiment & its Connection to "Pseudoscience" Introduction Hello everyone :), thank you for taking the time to view this as I have ALOT of questions regarding The Double Slit experiment and its connection to "The Law of Attraction" (LOA) or what many call pseudoscience. I...

The meaning of double slit experiment... As i understand the outcome of the double slit experiment is firstly the Photons of light that were fired have no true location and seem to jump about and interact with themselfs. So my question to that is, have they tried anything bigger than a Photon...

Double slit interference "missing" maximum problem Homework Statement In the double slit interference experiment, d is the distance between the center of the slits and w is the width of each slit. For incident plane waves, an interference maximum is "missing" when what relationship between d...

Superposition caused by - Double slit, Mach-Zehnder Quantum superimposed paths/waves interfere ...for example the double slit experiment (single particle interference) Quantum superimposed paths are effected by obstacles such as opaque, half silvered mirrors, refractive index transparent...

This scenario is identical to the classic double slit screen experiment except that the photon is at extremely high energy. The energy is so high that the photon's momentum maybe registered by a mechanical measuring device(i.e spring or accelerometer attached to a receiver). At the moment of...

Homework Statement The question is as follows, I'm truly stuck where to start here, any help would be much appreciated: A transparent paper of refractive index 1.45 and thickness 0.02mm is pasted on one of the slits of a double slit experiment. Monochromatic light of wavelength 620nm is...

Homework Statement Homework Equations The Attempt at a Solution As air is gradually removed from one box, the fringe pattern shifts towards that box. Hence total number of maximas that pass through the central is calculated. However, according to...

How would the double slit experiment work if we were to use gravity as a detector? That is, a very localized but massive gravitational field near one of the slits. Since we are not observing when an electron passes through the slit, the interference pattern should remain. But on the...

Is there any evidence that when the electrons pass through the single slit as a wave rather than a particle? Just curious because a single wave should provide the same Pattern as a particle.

I often read that electrons that pass through two small openings in a wall will land on a back screen and make a pattern as if the electron were a wave. But if we look at the electrons the distribution on the screen is as if the electrons are particles. What does it mean to "look at the...

If separate baffle around two different substances，What impact on the interference fringes？

well i am a starter in QM, i have 2 big doubts ! let me first tell what i understood , there is phsi which defines a state of a system, phsi times x is a position operator and phsi 's derivative of x multiplied by i h is its momentum operator ... well then i operator these in phsi and what do...

Some questions have been haunting me about this experiment for some time. I'm mainly interested in what we observe from the perspective of the projection screen. First let's imagine that there is only one slit, and we are observing from the projection screen looking back at the slit with the...

Homework Statement Two narrow slits are .6 mm apart. The dark fringe of order 1 is 1.7 degrees from the central bright fringe. What is the wavelength of the light? Homework Equations D sinθ = (m + 1/2)λ --> chosen because it was destructive m= order d= distance between slit The Attempt at...

Hello all, I was looking through my textbook on the double slit and it talks about constructive interference occurring at path differences of m \lambda and destructive interference occurring at path differences of (m + 1/2) \lambda where m is an integer. This is obvious if the waves leave the 2...

Homework Statement Blue light of wavelength 400 nm passes through two slits which are a distance d = 1×10−4 m apart. This produces a double slit pattern on a screen L = 12 m away. (The screen is parallel to the plane of the two slits.) If the central bright fringe is denoted the “m=0...

Hi forums I really want to do some experiments with lasers and i was wondering if for the double slit experiment a 100mw green laser is so powerful and bright. also there is a 30mw laser, would that be better. another thing is that i wanted to make a laser "microscope" but i was worried that a...

Homework Statement See attached image Homework Equations y=L*tan(theta) m*(lambda)=d*sin(theta) The Attempt at a Solution Lambda = 640 nm = 6.4x10^-4 mm m*(lambda)=d*sin(theta) 1*(6.4x10^-4 mm) = (0.25 mm)*sin(theta) theta = 0.15 degrees y = L*tan(theta) This is...

Why did Young specifically perform a double-slit experiment to demonstrate the wave nature of light, since light will diffract and interfere even through a single slit? Is there something special demonstrated by the double-slit experiment that's not demonstrated by a single-slit experiment...

Hi, I'm reading N. Zettili Quantum mechanics. In the "double slit experiment", when the beam of the electrons pass the the two slits, they present an interference pattern on the screen. But when we have a light source there to trace the electrons, we see what we have expected to see of the...

Homework Statement Light from a sodium lamp (\lambda \; =\;589\;{\rm nm}) illuminates two narrow slits. The fringe spacing on a screen 150{\rm cm} behind the slits is 4.0{\rm mm} . Homework Equations I think I should use: d*(y/L) = m(λ) The Attempt at a Solution I did: d =...

Hi, I was watching a Royal Institution lecture on this experiment. Using light, it's not quantum physics, it's waves; when the lecturer considered using particles, like individual atoms, and no detector, you get bands like an interference pattern. Is this something that has actually been done...

I realize that the people here must be sick of answering stupid questions about the double slit experiment, and different ways of setting it up, but if I may, I have a question about what you would expect to see if the double slit experiment were set up in a slightly different manner, and why...

Homework Statement The following data was obtained via the double slit experiment: angle to the eighth maximum = 1.12 degrees distance from slits to screen = 302cm = 3.02m distance from first to fifth mimum = 2.95cm distance between slits = 0.00025m find the wavelength. Homework Equations...