Double slit Definition and 825 Threads

The apparent path of an object is different for observers in different reference frames. A ball dropped from the top of the mast on a moving ship lands at the base of the mast. An observer on the ship sees the path as straight down while one on the dock sees the path as a diagonal. How many...

Homework Statement The more I think about path difference, the more confused I get. First of all, HOW DO PEOPLE know that the path difference is dsinθ? Why do we draw a line coming from the first ray that is PERPENDICULAR to the second ray when determining path difference? Please see...

Hi all, My limited knowledge of quantum decoherence leads me to believe that it can be demonstrated experimentally via rather humble apparatus involving low power lightbulbs, a few sensors, & some plywood with holes in & some switches etc. I was just wondering what kind of pattern you get if...

Homework Statement This is an old test question that I failed, but this material will resurface for the final so I just wanted a detailed description of what the full answer would've been. I'll include the rubric too so you'll know what I'm up against. Can you include explanations and...

Greetings! From my last post, to this my understanding of QM has improved somewhat. (thanks mostly to these great forums). I was wondering how the Multi Universe Theory treats the observer effect in a basic Quantum Double Slit Experiment ? from howstuffworks.com :- "“When a...

In a double-slit experiment electrons are sent through a doule slit where an indicator determines the slit each electron went through. These indicators tell the y coordinate to within d/2, where d is the distance between the slits. If this is the case show that the diffraction pattern will be...

I know even molecules can be used and the result still emerges. What is the density of [pick a type] of atoms or molecules when the experiment stops working? Also, as you increase the density of whatever you're using, does the result get less and less like what you get when you use photons...

I'm watching Leonard Susskind's online QM lectures, and in it he talks about the double slit experiment. He says that if the particle leaves a "mark", allowing you tell which slit it went through, (for example a "1" vs a "0" on a computer read out) this destroys the interference pattern. But...

Hello! I have this doubt with a variation of the double slit experiment: Let us suppose that we are sending electrons to the screen. When both slits are open, the wave function at a given point x of the screen is the sum of the functions phi1 and phi2, respectively corresponding to reach x...

particles act differently when being observed. WTF :confused: check out the video...weird... http://www.youtube.com/watch?v=wEzRdZGYNvA&feature=fvst

Hi there, Single electron realizations of the double slit experiment is always mentioned as one of the standards 'proofs' of particle/wave duality, along with a series of pictures with single dots appearing in an interference pattern. Has anyone ever made the experiment with single...

Hey All, I'm probably going to get railed for not searching hard enough for an answer to my idiotic question, but here goes anyways... The double slit experiment results go like this [correct me if I'm wrong here] 1/ One slit open --> One band\probability dist. 2/ Two slits open -->...

I plan on trying to recreate a version of Young's double slit experiment for a science fair. All the methods I've found for it recommend using a helium-neon laser. Would a laser pointer or some other cheaper laser work? For the slits my idea is to get a glass microscope slide, paint over it then...

I am trying to recreate Young's double slit experiment and I can't figure out what he used to detect the photons. In some things I read it says he used a photographic plate. However, these are outdated and no longer available. Any ideas?

In the double slit experiment is it known if the energy of the "particle" is less after passing the plate?

I've read that when one performs the double slit experiment (dse) without any detectors to "see" which slit the photon goes through one gets an interference pattern. When one places a detector to see which slit the photon goes through the interference pattern disappears. My question are these...

Many textbooks use the double slit experiment to introduce quantum effects. However, all texts I know use handwaving arguments instead of the whole formalism of QM. Especially dynamics is completely omitted. I don't expect that a complete microscopic description -including the walls- has been...

I'm trying to perform young's double slit experiment at home and I need assistance. Several problems arise such as what should be used as the light source (laser vs low watt bulb) and the photon detector (photomultiplier vs phototransistor). My goal is to replicate the scenario where one...

It doesn't have to be a superfluid or silicon oil. Let's suppose a water droplets are falling to a hidrophobic (wd40 sprayed LOL) surface with double slits. It seems probable to me that scenario will happen that droplet will split on surface, pass through both slits (in some random ratio) and...

Homework Statement Blue light (λ = 482 nm) is directed through parallel slits separated by 0.15 mm. A fringe pattern appears on a ascreen 2.00 m away. How far from the central axis on either side are the second order dark bands? λ = 4.82 x 10-7 m d = 1.5 x10-4 m L = 2.00 m m = 2 y= ...

I am trying to recreate the Young double slit experiment at my house with a laser. You could call it a homemade experiment I suppose. My question is if I use a laser pointer for my photon source what would I use as the photon detector. I want to have some sort of screen that can detect the...

It maybe the lateness of the hour, but I've just had another one of those awkward thoughts that only people who know more than I do can provide an answer for (I'm compelled to edit quickly and note that by this I mean that no one I know's going to have a clue, not that I'm somehow an authority...

hi i often heard about the double-slit experiment with electrons and read that it would give the same pattern as the double-slit experiment with photons. so the only difference would be the shorter de-broglie wavelength of electrons compared with the wavelength of ordinary photons. but i...

hi! first of all: I take the opportunity to introduce myself and to say hello to every member of this forum. now. I'm not a pro-physicist: I'm a programmer/3d graphic artist/musician/and everything else curious; so go easy on me :) I was seeing a BBC's documentary about "what is reality"...

Hi - brand new here, so go easy on me! :) I have been considering that the major difference between the observed and the unobserved in relation to the behaviour of light particles appears to be missing something. Every "measurement" device used in the unobserved tests relies on linear...

Hi, I was trying to learn a bit of quantum mechanics from Feynman lectures. In the 3rd volume of the Feynman lectures, he talks of the double slit experiment with electrons. He says that if we keep a light source near the first slit, so that every time an electron passes it scatters light and...

If we add polarizers to the slits like DrChinese describes above, I believe there is a difference in predicted outcomes between quantum physics and classical physics. A difference I believe can be tested. Both quantum and classical physics predict that the interference pattern will disappear...

Homework Statement Upon using Thomas Young's double slit experiment to obtain measurements, the following data was obtained. Use this data to determine the wavelength of light being used to create the interference pattern. DO this in 3 different ways! The Angle to the Eighth maximum is 1.12...

Hello, I'm not sure if this is the right part of the forum to be posting this in (if it's not, feel free to move me), but I have a question about the double slit experiment. For my AP Physics class, a group of seven other guys and myself are researching the double slit experiment, both...

I performed a successful double slit experiment this morning. I'm doing it for my science fair, and I spent four hours last night trying to figure it out. I used every material I had that could be used. This morning, I woke up, rushed to the bathroom, and grabbed a comb. I used electical tape...

I am relatively new to QM and so have a couple of basic questions for you all. I understand that the double slit experiment creates an ‘interference pattern’. What bothers me, is that it seems like an assumption to me, that the pattern created could *only* have been made by two waves...

I have recently learned about the double slit experiments using electrons and photons. This has completely blown my mind and I want to learn more. With this aim I have a question that I hope somebody on here can answer. For this question I want to consider the use of electrons in the double...

So I read that in double slit systems the intensity of the "particle" source does not matter. If it is known that only one particle is in the system at a time, the interference pattern will be the same as observed when there are multiple particles in the system. From this we can conclude that...

Has anyone taken into account the gravity of the slit material causing the electrons to quiver and cause a wave effect in the double slit experiment?

A detector screen far from the slits will show wave patterns whereas a detector near the screen will show particles. My question is what if we maintain the detector screen far from the slits but put some say block of wood near the slits, will we detect wave or paticles?

can the double slit experiment be performed with systems other than light?

Hi hi, first post ^^ Anyway, I encountered this little problem with the derivation of Young's double slit formula. The standard derivation found on the internet and my textbook is shown here: http://schools.matter.org.uk/content/interference/formula.html When deriving, a few errors had...

1. Will wave functions collapse in a photon double-slit experiment after we place a detector at one of its slits and detect one photon? 2. Will wave functions collapse in a photon double-slit experiment after we detect a photon on the screen? 3. Will wave functions collapse in an electron...

Hey guys, I've just got a couple of questions about this prelab I need to do for the Double Slit experiment. And just to make sure this is clear (I have no idea whether the method used in this experiment is normal) we have a double slit and a slit blocker. The slit blocker is after the...

Homework Statement If Young's double-slit experiment were submerged in water, how would the fringe pattern be changed? Homework Equations None...but maybe d\sin(\theta)=m\lambda The Attempt at a Solution It would not because the waves still propagate in the same manner and the...

I'm not a physicist, but have been thinking about these test lately and have hit some roadblocks that should be answerable. 1. Why can't we measure a single photon to determine if it fell into the interference pattern or acted as a particle? I understand this is because I'm thinking of two...

Hi there, I've been told even with detectors behind two slits detecting if a particle comes through, that doesn't exactly mean that the quantum system is now in a mixed-state (for example, the quantum eraser experiment of Scully). How would we be able to differentiate between whether the...

in the double slit experiment , why must the two slits be at the same distance from the first slit?should the interfering waves have the same phase and why?

All I know about the Double Slit Experiment is that some particles are shot at a pair of slits, and the particle apparently splits, goes through both slits, and interferes with itself, creating an interference pattern, but if the particles are observed, they collapse and give the results you'd...

Hi, I think that this is (should be) a straight forward question: when conducting the double slit experiment, is there a relationship between the brightness / measure of the light source and the sum of the "peaks" from the interference pattern? (I have done a number of searches but can't find...

My name is Joe Fiero. Ever since I was a little kid, I loved science, especially science fiction. Sliders, Back to the future, Star Trek. I never had a chance to get a degree in the things I loved the most because I came from a poor family... which has lead me to a path of self education and...

hi, Please help me understand this... could you set up the double slit experiment (light, one photon at a time) in such a way that you could measure the time between a photon leaving the gun and arriving at the detector? you could then calculate the path the photon took, so would the...

Homework Statement I was a asked a question from an experiment: What happens if the light shone into the diffraction grating or a double slit is not perpendicular to the diffraction grating or double slit? What will happen?The Attempt at a Solution Straight away i can tell that the light...

Homework Statement Hey everyone, I am doing youngs double slit experiment to find the wavelength of a light source but i am having a lot of trouble finding the independent and dependent variables. Can people suggest what they could be? Thanks. Also, some controlled variables would be...

Two very narrow slits are spaced 1.8 \mum apart and are placed 35.0 cm from the screen. What is the distance from the first and second dark lines of the interference pattern when the slits are illuminated with coherent light with \lambda =550 nm r1-r2=m\lambda dsin\theta=m\lambda...