Slit Definition and 1000 Threads

Homework Statement Two narrow slits are 0.4 mm apart. The dark fringe of order 5 is 1.2 degrees from the central bright fringe. What is the wavelength of the light in nm? Homework Equations dsin(theta) = (m +1/2)lambda where d = distance between silts m=order lambda = wavelength...

Hey guys, I am trying desperately to figure this problem out. I have not done a problem like this ever before, and it is on our homework in a regular high school physics class. The teachers did not even teach us, this is just my attempt from research and previous knowledge. Homework...

Hi Everyone, I'm trying to fill in some gaps in my understanding of the double slit experiment. I think I'm most confused about the detectors. Before I start asking questions, I'd like to spell out what I think I understand with a summary: --- Summary of DSE --- Equipment 1. source...

if the double slit particle experiment is observed by an animal and not by any human for eg. chimpanzee, through which slit the particle has passed would it collapse the wave function and form particle pattern. The particle are only observed by the chimapanzee, so it can know which slit the...

Mechanically speaking, where is the photon emitter aimed when there are 2 slits? If the experimenter was using an accurate emitter, wouldn't he/she expect the photons to hit only where it was aimed, e.g. either one slit or neither slit? Is it that the emitter oscillates, so it can aim at each of...

I have been trying to understand the result of the double slit electron experiment I’m still not clear abt the result of the experiment. I have seen the Dr. Quantumm - double slit experiment video(). Its very simple explained. it says when an measuring device is placed to look through...

Find the slit separation of a double slit arrangement that will produce interference fringes 11.5 mrad apart on a distant screen with light of wavelength 471.0 nm. tan(theta) = y/D asin(theta) = p * wavelength I know that I'm trying to solve for a, and that asin(theta) = 11.5, but I feel like...

It was a good while ago since I heard about this particular experiment, but I remember vaguely reading about how in one instance they recorded the observations, but then deleted the data before anyone could look at it, and in that instance the wave was still produced. Thus showing that it really...

Can we do double slit experiment using ,let's say phonons.

Hello , as per diagram (attached) regarding Huygens slit experiment / diagram When the wave enters the slit - why does it form a number of point sources ? There are 6 as per the diagram, Are these the horizontal wavelengths of the electromagnetic waves ? Thanks, much appreciated

Homework Statement In a double-slit experiment, the two narrow slits are spaced 0.20 mm apart. A viewing screen is put 1.2 m behind the slits. A parallel light ray is shining on the slits. (a) If the wavelength of the incoming light ray is 633 nm. What is the width of the central bright...

hi maybe I'm asking a stupid question, I'm a layman, and i didn't succeed to google out the answer. while performing single photon double slit experiment, why the photons don't just get absorbed in the separation between the slits, like they do in the screen behind. and consequently...

a link to my youtube page of a rotating single slit and 2 single slit's merging,comments welcome on what you think it shows,or don't show

Homework Statement A grating with 349 lines/mm is illuminated with light of wavelength 412 nm What is the angular separation between the two lines formed in order m=2? Homework Equations \vartheta = m\lambda/d The Attempt at a Solution I did not know how to use this equation...

Hi, I am a bit confused regarding using FFT to calculate the 1D single slit diffraction pattern.. Let's take the simple setup shown here: http://electron9.phys.utk.edu/optics421/modules/m6/images/sslit.gif" If I wanted to do a quick calculation using Matlab, I would create a 1xN matrix...

Delayed choice in half silvered mirror or double slit For now, I am focussing only on the half silvered mirror: there are two paths/arms that are created. My question is: 1. If a detector/obstruction is placed on either of the two paths after the photon has passed but before its hit...

Homework Statement 1. What will happen if we use white light as the source of young's double slit experiment? 2. If the experiment is done in water, what will the effect to the yn? yn is the distance of nth fringe from center fringe. Homework Equations d sin θ = nλ d y/D = nλ The...

Homework Statement You need to use your cell phone which broadcasts an 830 MHz signal but you're in an alley between two massive radio wave absorbing building that have only a 15m space between them. What is the angular width in degrees of the electromagnetic wave after it emerges from between...

i have posted a video on youtube,where i did the double slit experiment,firstly with a shallow slit,then with a slit approx 35 times thicker,then did the experiment without lens on laser,i would like to have a chat about what it all shows,and what it says to you (any one)

When a photon encounters a beam splitter, say a half-silvered mirror, there is a 50-50 chance it will be reflected or passed (tunneling). Does being reflected/passed constitute a QM "measurement"? Thanks in advance.

I'm reading the double slit experiment (Cohen-Tannoudji chapter 1 - complement D) and it is said: "We are going to consider Young's double slit experiment again to demonstrate how complementary and uncertainty relations are intimately related. Assume that the plate P, in which the slits are...

Hi all, I'm not trained in physics beyond high school but have a healthy interest and understand a little quantum physics and special (still grappling with general!) relativity. Here's a quick question on a pop.science book I'm reading at the moment. The book is by Marcus Chown, it's called...

Homework Statement A parallel beam of mono-chromatic light (500nm) is incident on 2 long narrow slits: slit width is 0.1mm and the distance between slit centres is 0.3mm. a) How many bright fringes cover the central diffraction maximum? Homework Equations Condition for constructive...

Does the distance from the photon/electron gun to the slit matter at all? Or even the distance from the slit to the photographic plate?

Homework Statement Light of two wavelenghts L1 and L2 (L1,L2 = lambda)creates interference fringes in the Young's double slit experiment. To calculate the least distance from the central maximum where the bright fringes for both L1 and L2 coincide. Given: the distance 'd' between the two...

Ive been marked wrong but not sure why: The distance between the first and fifth minima of a single-slit diffraction pattern is 0.400 mm with the screen 41.0 cm away from the slit, when light of wavelength 570 nm is used. Find the slit width. y=m(theata)D/a m-order = 5 D-distance...

Basically I am wondering if the act of detecting the path which the electron didn't go affects the interference pattern. But I'll be more specific. So we have the double slit experiment with electrons, they have a 50/50 chance of going through each slit, and if we have this setup we will...

Correct me if I'm wrong, but isn't it a fact of quantum life that it's not possible to obtain a diffraction pattern from the double-slit, while at the same time knowing what photon emerged from what slit? And if I am not wrong, wouldn't it be a simple matter to conduct such an experiment based...

Lets say some aliens scaled up the two slit experiment to an enormous size. It is so large that shooting 100kg masses of carbon through the slits creates a diffraction pattern. The aliens then decide to replace the carbon with some captive humans and shoot them through the slits to see what...

Homework Statement I am to calculated the wavelength of the laser I shone through different slit patterns to create diffraction patters on a screen. For the single slit diffraction, Data: xm is the distance from the central image to the mth minimum. x1 0.008 x2 0.015 x3 0.023 x4...

I was wondering where could I get a slit for the Double Slit Exeriment that I am trying to do.Thanks

Homework Statement Light of wavelength 680 nm is incident normally on a diffraction grating. Two adjacent maxima occur at angles given by sin θ = 0.2 and sin θ = 0.3, respectively. The fourth-order maxima are missing. (b) What is the smallest slit width this grating can have?Homework...

Can someone summarise what is the currently accepted interpretation of how measurement affects the interference pattern in a double slit experiment? (Answers which say things like 'the electron knows if it is being observed' are not acceptable - :-) ) To quote from the PF rules, I'm looking for...

I have a question about the situation with the two slit experiment where detectors are placed by the two slits to determine which slit the particle has gone through (and destroy the diffraction pattern). Okay, so what I'm wondering is what happens if the detectors' accuracy is not fixed, but...

Homework Statement Red light with wavelength of 700 nm is passed through a two slit apparatus. At the same time, monochromatic visible light with another wavelength passed through the same apparatus. As a result most of the pattern that appears on the screen is a mixture of two colors...

Hello everyone, I recall reading some time ago about an extension to the dual-slit experiment, where researchers either closed or opened a 2nd slit after the particle passed the slit but before it hit the detector. Does anyone know about this research, like the results, and who performed...

[b]1. When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 51.5°. Determine the width of the slit. [b]2. sin\theta=\lambda/w [b]3. w=450e-9/sin(51.5)=5.75x10-7 I tried this but it said it was wrong, if...

I was browsing about the double slit experiment and found the following tidbit on Wiki: (emphasis mine) I knew that electrons could interfere with themselves - I understand how an electron can act like a wave. Even an atom I can understand. But a molecule? This isn't merely suggesting...

When measuring the fringe width of a superposition pattern from a monochromatic source - I am using a laser. What problems/inaccuracies could I have when measuring it?

erm anyone knows why for destructive interference to occur for a fraunhofer's diffraction pattern, the equation is a/2sin(theta) = m(lamda)/2 , ==> sin(theta) = m(lamda)/a ? where a = slit width lamda = wavelength theta = angle the ray makes with the central axis the problem i have...

Homework Statement For light from a discharge lamp, the first-order bright fringe is observed at a perpendicular distance of 2.35cm from the mid-point of the slits, when the slit-to-screen distance is 1.2m and the slit separation is 0.03mm. What is the wavelengh of the light from the lamp...

Question 1: Why is it required for the slit separation to be at least one wavelength in the double slit experiment? Question 2: Why do we need to place a single slit before a double slit in the double slit experiment? Thanks in advance

I could not find any explanation or illustration where it is shown where do they actually aim electron gun (or something) in the version of the experiment where they shoot electrons one-by-one. I suppose this is how original setup looks like: ====================screen== \ / \ /...

Homework Statement A radar tower sends out a signal of wavelength lambda. It is x meters tall, and it stands on the edge of the ocean. A weather balloon is released from a boat that is a distance d out to sea. The balloon floats up to an altitude h. In this problem, assume that the boat and...

Homework Statement What is the slit width? Wavelength is 635 nm. Distance between screen and slit, 2.5 m. Distance on screen between first and second minima above the central maxima is delta 6 mm. Homework Equations D* sin theta * = m * lambda tan theta = x/ distance between screen...

Hi everyone, I have a question concerning the double slit experiment that I would like clarified. According to a book I am reading if the electrons passing through slit A are of spin up and the electrons passing through B are of spin down then there will be no interference pattern (just the...

Has this type of experiment ever been performed? Firing electrons one at a time we can easily get the which-path information and see if interference dissapears or not. What actually happens? Also, if we do the double slit experiment with a usual laser but in a smoked environment (in order to...

Hi, I have a question about the famous double slit experiment. They say that if an observer like a camera or a person is watching the experiment then it collapses the wave function and two marks appear instead of an interference pattern. Does anyone know what what happen if a totally...

what is the effect of placing a slit of say one tenth of an inch infront of a laser beam (3 inch dia )with a divergence of say one degree upon the divergence of the emanating beam?(slit placed symmetrically along the beam axis) ? would the emanating beam also be of the same divergence ?

I have a question about Young's Light-double slit experiment, is there a minimum ratio between the intensity of the light and the size of the slit or the distance in between the slits to alter the results? For example, if a wall has two open doors into the same empty, standard room and a photon...