Interference Definition and 999 Threads

Imagine a thick cylinder with a retaining ring groove cut in the ID. I'm replacing the retaining ring with a split ring pressed into the groove. The split ring I'll have made along with the tool to install it. What I would like to determine is the amount of interference and the force...

Homework Statement How many interference fringes are visible in the central diffraction peak if the ratio of slit separation to slit width is 3.125? Homework Equations d*sin(θ) = m*λ for interference maxima with slit separation d, maxima are at m = 0, 1, 2, 3 ... a*sin(θ) = m*λ for...

Hello, I am having some difficulties understanding this concept. It seems like wikipedia and my notes/teacher contradict each other According to my equation sheet, the equation for dark spots is 2nt = mλ and for bright spots is 2nt = (m + 0.5)λ. However, if a phase shift of 180 degrees occurs...

Homework Statement I don't have a question on a specific problem, I am more caught up in the determination of the phases- I'll give a general problem to use as an example: In Fig. 35-41, light is incident perpendicularly on a thin layer of material 2 that lies between (thicker) materials 1...

Consider two scenarios: Scenario 1: Single slit, single photons sent one by one. We would have a blob or column of dots. However inside this column is there an interference pattern hidden? Scenario 2: Double slit, single photons sent one by one, however we have instrumentation in...

I am an electronics technician, and I work on various types of electronic equipment including radio communications devices which is the reason for asking this question. I was recently troubleshooting a radio communications malfunction, basically when squelch was broken, there was a “noise”...

Homework Statement http://img5.imageshack.us/img5/4605/lchuynh177setphys52awee.png The figure shows the interference pattern that appears on a distant screen when coherent light is incident on a mask with two identical, very narrow slits. Points P and Q are maxima; Point R is a minimum...

Thin-Film Interference: Coating a Lens -- Answers found, explanation needed! Homework Statement Boxed answers are the correct ones. Homework Equations 2L=(m+1/2)(λ/n) for constructive interference (maximum reflection, bright film) 2L=(m)(λ/n) for destructive interference (minimum...

Homework Statement A very thin sheet of plastic (n=1.70) covers one slit of a double-slit apparatus illuminated by 630 nm light. The center point on the screen, instead of being a maximum, is dark. What is the (minimum) thickness of the plastic? Homework Equations Constructive...

Homework Statement A source emits pairs of particles "back to back", 50% into directions a1 and b1, 50 % into directions a2 and b2, where the choice between a1+b1 and a2+b2 is fundamentally undetermined. Insert Diagram A suppose that directions a1 and a2 are combined on a 50/50 beam...

Homework Statement 8 bright fringes are counted across 1.06 cm in the air wedge. Homework Equations Δx = L (λ/2t) The Attempt at a Solution i don't understand whether Δx is: 8Δx = 1.06cm or 7Δx = 1.06cm it said 8 bright fringes but Δx = the distance between...

I have a confusing question mainly due to my lack of understanding of Quantum Mechanics and spin! here it goes anyway... In an atomic orbital, like the 1s orbital, two electron waves with opposite spins occupy the same area of space. Now, does this mean that their waves should interfere with...

Homework Statement A glass-plate of 350 nm thickness is free standing in space. At the angle of 75 degrees, relative to the glass-plate plane, a white light point-source is placed. The diffraction (probably a typo, and should really be refraction) index of the glass is 1.33. On the same side...

Homework Statement What are the values of incomplete destructive and constructive interference? Homework Equations The Attempt at a Solution when the path difference is in between 1 wavelength and 0.5 wavelength, there would be "incomplete" destructive interference. From my...

Not sure whether to put this in the QM forum or the classical forum, you'll see why-- I was thinking about the http://grad.physics.sunysb.edu/~amarch/ version of the double slit experiment, in which the information about which slit the particle went through is obtained in a somewhat unusual...

I am trying to play a movie from my macbook pro with the video to a standard HD tv and the audio to a guitar amplifier. I connected the guitar amplifier to my macbook pro through a 1/4" to headphone jack cable and the sound outputted to the amp was fine, just as I wanted it. As soon as I...

hi everyone, i was wondering whether i can change this sentence ( if the phase difference changes rapidly , the average effect of no interference is recorded.) to( if the phase difference changes rapidly , the average effect of no superposition is recorded.) as i remember that the term...

I put together this little movie as (hopefully) the first in a series. http://www.youtube.com/watch?v=xjMjWtntm9k" My target audience is a second semester class of physics students that have already had a lectures in basic wave optics. When I give this URL to my students, it's with the...

5. Two slits are separated by 0.195 mm. An interference pattern is formed on a screen 33.0 cm away by 656.3-nm light. Calculate the fraction of the maximum intensity a distance 0.600 cm away from the central maximum. d =.000195m L = .33 m lambda = 656.3 nm y = .006m it's a small angle...

hey guys, for condtion of observable interference, why do the path difference should be smaller than the coherent length ?? thx

Homework Statement "Light is incident from above two plates of glass separated on both ends by small wires of diameter d = .6um. Considering only interference between light reflected from the bottom surface of the upper plate and light reflected from the upper surface of the lower plate...

I know about the law of conservation of energy, and I understand interference effects conceptually, but when I put the two together I'm a little confused. I know that the energy of light must simply by transformed in destructive interference...but where does it go and how? If the...

Homework Statement Light of wavelength 470 nm passes through a block of material with a refractive index n = 1.30, some of it is reflected off the air-block boundary and some of it is transmitted through air (n=1.00) with thickness t, and is then reflected off another block also with n = 1.30...

Hi, I am new to QM and really confused with some concepts. Assume two alpha particles come out from two different sources and reach the same detector, so the probability to detect some particles should be |f+g|^2 (f, g are the amplitude of 1st and 2nd alpha particle, respectively). If they are...

Homework Statement Write a wave in one space dimension as ARe(ei(kx-wt-d))where A is the amplitude of the wave. Find a second wave of the same frequency such that the sum of the two vanishes at x = 0 and x = L. Assuming the wave velocity c = w/|k| is fixed, for what frequencies ! is this...

I have followed some of the previous posts on the topic , but the conflicting arguments have left more than confused. Consider this simple scenario : Two wave pulses on a string generated by identical sources but with a phase difference of 180 degrees meet and interfere destructively. For...

Okay, I have this problem worked out, but I have no clue if my answers are right. Could someone please check my work and give me some confidence or show me where I may have messed up. Homework Statement Two loudspeakers, one of them generates sound with 400 W power the other with 100 W. The...

Homework Statement Two speakers located 4.0 m apart. Listener is seated 25.0m from 1 speaker, and 27.0m from the other. We drive the two speakers at a freq. which we sweep from 100 to 500 Hz. If the 2 speakers are in phase, find the frequencies at which the waves constructively/destructively...

Homework Statement A 4-slit interference pattern is created by 4 slits spaced 2μm apart. At what approximate angle θ does the intensity go to zero the first time, if the incoming light has a wavelength of 450 nm? θ1st min = Homework Equations d*sinθ = m\lambda The Attempt at a...

What does it mean physically when radio stations mix? As in if you are listening to one station, but you begin to here another and eventually only here the wrong station.

Hi, Two loudspeakers are connected to the same audio oscillator. An observer walks in between them. At a point M, halfway between the speakers he hears a loud sound. By the time he gets to a point P 2m away from M he hears no sound at all. Calculate the maximum wavelength of sound emitted by...

Hello, was wondering a couple of details on the wave nature of electrons and the state of the art in this field. In particular: Is it practical and possible (easily) to create a cm sized electron interference pattern (fringes are in the cm size magnitude). I have so far seen Low Energy...

I have two questions concerning what happens when light interference occurs. In destructive interference of coherent light beams, how is energy conserved, both when interference occurs in air and in a vacuum. When non coherent light beams intersect is space there is no interference...

Hello In my textbook There are two headlines "Superposition" and "interference but I can't recognize any difference between the two terms So what is the difference between them? Thanks

If you have a 3 phase 4 wire distribution where the 3 phase conductors and 1 neutral is inside a pvc conduit, how would you model the force of the electromagnetic field at a certain distance away from the conduit? Assuming the loads are balanced, the currents would sum to zero on the...

Hi, Question: X and Y are two identical sources of sound which emit in phase. Calculate the lowest possible value of frequency of the sources for there to be (a) constructive (b) destructive interference at Q. So, X is at 1.8 m from Q and Y is 1.2 m away from Q. a) If they leave in...

Hello, this is my first visit to PF. I have a question that I can tell isn't very difficult, but I can't seem get my head around it, maybe i just need to review my text and make an attempt tomorrow. Homework Statement Consider the point P in the following diagram. Analyze this diagram to show...

Suppose you have two coherent microwave beams, one beam at 45 degrees to a reflecting wall and the other one at 90 degrees, with the two beams pointing to the same point on the wall. If the two beams are 180 degrees out of phase and destructively interfere at the point on the wall, will the...

Can anyone break down "quantum interference" in the tunneling transport through aromatic organic molecules? The Math is a little fuzzy, but with a few seminal reference or a conceptual description i might be able to wrap my mind lips around this knowledge pop! haha. any help would be appreciated.

Homework Statement We have a thin film of glass which has thickness t=\lambda and n=1.5 and light (\lambda) passing through it with an angle \theta_0. We have to find the minimum angle that allows us to see both constructive and destructive interference. Homework Equations Max...

Homework Statement I've been reading a book about waves. I skipped the test earlier this year because I had not done any problems and thought it would be a waste of time to try. But now I kind of have to do it, I've re-read the book but it's much to understand and remember. Especially the...

Look at the picture below, I have to prove that the optical path length difference is \Delta=n(BC+CD)-BE=2nd\cos(r) [PLAIN]http://img200.imageshack.us/img200/2271/schermata082455775alle1.th.png The problem is just how to get 2nd\cos(r) I actually don't have any idea :\ I have...

Hello, I am trying to understand thin film (in air) interference but I have a problem: I know we have destructive interference when \delta=(2m+1)\pi. Now i can try to calculate the thickness of the film to get it, so since \delta =\frac{4nt\pi}{\lambda} - \pi where t is the thickness...

Two radio antennas A and B radiate in phase. Antenna B is a distance of 130 m to the right of antenna A. Consider point Q along the extension of the line connecting the antennas, a horizontal distance of 50.0 m to the right of antenna B. The frequency, and hence the wavelength, of the emitted...

Right so I've been stuck with this for a while now and I'm sure it's just something simple that I've missed. Right so the question says there are a pair of closely spaced slits (0.300mm apart). By changing the spacing the bright fringe moves from position m=2 to m=3. The wavelength remains...

For example, when two light waves completely cancel each other out, there is the black on an interference pattern, indicating absence of light. What happens to the photons? It seems they cease to exist. Also, How does this relate (or not) to the "Conservation of Energy" law? Any...

Homework Statement A college student is at a concert and really wants to hear the music, so she sits between two in-phase loudspeakers, which point toward each other and are 53.2 m apart. The speakers emit sound at a frequency of 459 Hz. At the midpoint between the speakers, there will be...

I have only an completed one course on quantum mechanics so please excuse me if this seems rudimentary. In my course we only dealt with electrons and their interference with one another. Is it possible for an electron and a proton to interfere with one another? Or more generally, can...

Homework Statement At a young's experiment arrangement, there is a 500nm light beam, a distance of 1m from the slits to the screen and a 0.25mm between the two slits In what way the interference pattern will change if an adhesive tape is being taped to one of the slits with a 1mm thickness and...

Can someone explain what the difference is between the expectation value of an observable in a pure vs a mixed state. The equations are identical. For example with spin up and down |A|^2<S_u|O|S_u> + |B|^2<S_d|O|S_d>