Interference Definition and 999 Threads

A train is moving from the left to the right direction. There is a light source emitting 2 beams of lights toward 2 slits A and B at both ends of the train. The source is put near the slit A Than B. A ground observer is watching the scene and sees that the 2 light rays reaching A and B...

Homework Statement Two radio antennas radiating in phase are located at points A and B, 200m apart. The radio waves have a frequency of 5.80MHz. A radio receiver is moved out from point B along a line perpendicular to the line connecting A and B. At what distances from B will there be...

I was wondering to what extent we understand the self interference of particles in the double slit experiment. More specifically, I have heard that a single particle, acting as a wave can pass through both slits at once and that is what causes the interference. This explanation seems a bit fishy...

When two waves interact producing a "cancelling" effect as seen by noise reducing headsets, what kinematic energy is associate with the effected medium immediately near the cancellation point(standing wave)? Furthermore, in an ideal setting, would it be possible to instantly reorient the...

I consider myself very well-read on the phenomenon of thin-film interference: how it works, how it's used in lens making, etc. HOWEVER... there's one thing I don't get: Thin-film interference only occurs for one specific wavelength at any given point (according to all the sources I've read)...

Hi all. Just a quick question, probably a silly one. Due to wave-particle duality all particles have both wave-like and particle-like behaviors. The wave-like properties of, say, an electron can result in an electron interference pattern. So, my question is: Can waves of different things...

Homework Statement Two waves on a string are given by the following functions: Y1 (x,t) = 4cos(20t-x) Y2 (x,t) = -4cos(20t+x) where x is in centimeters. The waves are said to interfere constructively when their superposition |Ys| = |Y1 + Y2| is a maximum and they interfere destructively when...

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...

I'm studying wave interference and I have a few questions regarding it that I can't quite figure out: 1.) I was once taught that for waves to interfere, they have to be of the same frequency, but then how can beat interference occur? What are the actual requirements for interference? 2.)...

I'm trying to write up an experiment that I have done on single photon interference. The design is as follows: Class 2 HeNe laser 25 micron pinhole double slit output via CCD I have all the data, but I cannot find anything that says that having a small pinhole about 80cm from the double slit...

Homework Statement When light is shined on thin films the interference pattern results in: a. there is no interference pattern *b. rainbow like colors c. light and dark pattern with no separation of colors d. a mirror quality reflection e. polarization of the light The...

Hello, destructive interference seems like an important part of quantum physics, but I'm finding it very hard to grasp it conceptually. For instance in the Elitzur–Vaidman bomb tester, destructive interference in the mirror is used to determine if one of the paths is blocked. What exactly is...

When you have waves that are out of phase by some fraction of a cycle, e.g not exactly in phase and not exactly 180 degrees anti-phase, how do you determine the phase (relative to the original component waveforms) of the resultant? Specifically, is there an equation that solves for phase...

1. Homework Statement "A thin piece of metal foil of thickness 0.0700mm separates one end of two pieces of optically flat glass. The top sheet is 12.0cm long. Light of wavelength 529nm is normally incident on the glass. How many interference fringes are observed per cm in the reflected...

In the double slit experiment there are interference terms which are responsible for the way in which particles appear on a screen (diffraction pattern). The density matrix for an electron with spin |+X> going into a stern Gerlach alligned in the z direction also has off diagonal terms which...

Because energy cannot be destroyed, when waves interfere destructively the energy doesn't really disappear, it's simply redistributed to areas of constructive interference, right? But isn't this energy redistribution instantaneous?

Hi, I wanted to ask a question regarding the D0 detector in the original Scully and Yoon-Ho experiment (from 2000): According to the paper itself, and to the wiki article: "Note that the total pattern of all signal photons at D0, whose entangled idlers went to multiple different...

Homework Statement A double-slit interference pattern is created by two narrow slits spaced 0.21mm apart. The distance between the first and the fifth minimum on a screen 60cm behind the slits is 6.2mm. What is the wavelength of the light used in this experiment? Homework Equations...

in explaining the interference pattern that happens in double slit, single particle interference - some of the interpretations, for example De Broglie–Bohm interpretation: assumes that (some sort of) "waves" travel through both slits simultaneously and interfere with each other the...

Homework Statement why do we need a viewing screen in order to see interference patterns? why can we see interference patterns through our fingers when we look at a distant light source and we don't need a screen in that case? what do we mean by visible light? can we see the wave itself...

Homework Statement Homework Equations y_{3} = y_{1}+y_{2} f(x,t) = y_{m}sin(kx-ωt+\phi) The Attempt at a Solution So, I'm going back over a proof done in my physics course, where the sum of two waves equals the resulting wave. The proof was on constructive and destructive interference. I'm...

Hey, I am having a project in Physics, and the project is about interference in Waves. We got a task, and I need to demonstrate how waves interfere with each other. I got a demonstration with Lasers, how they split up, but I also need a much more simple demonstration. Something like when...

Whatt happens during destructive interference of electrons. Two electrons(waves) combine and cancel each other out so no dot is produced on the screen?? Then where did the electrons go? First of all : How is a dot created on the screen? - is it because of the wave nature of electron or...

Hi, first post, so take it easy on me, I've had an idea for producing metallic objects with high surface area for several years, but lack the necessary physics knowledge to act on it or, really, inclination (and money) to go through years of school to gain such. The idea is as follows: A...

Interference Question: I'm trying to understand interference, I get the basic concept, that when two EM waves are superposed the resultant's amplitude of the vector sum of each original wave's respective amplitude. It's the following the creates confusion. Picture the figure below. Wave A...

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= ...

Two coherent waveforms (could be pulses or wavetrains), that intersect at an angle, as in the picture below. Assume that we are able to make the waveforms in phase and superposed at the point of intersection, such that they constructively interfere. In what direction does the...

I have a bearing that is fixed into its housing by means of an interference fit (to test the effects of having a bearing that has become stuck due to build up of contaminants). I am using a bearing of ID 15.92mm ± 0.005 made of High lead Tin Bronze Alloy with a thermal coefficient of expansion...

I posted this thought experiment in a previous thread before 4 months or so, but I would like to reiterate it now: A frame of reference (FOR) has double slits moves relative to a ground FOR. Let`s make an arrangement so that when the 2 ends of FORs coincide, 2 small slits of moving FOR are...

If we send one photon, at a time, through a single slit do we observe the interference pattern? Specially at the edges

Hi, I have a question about destructive interference. Suppose I have two very closely spaced EM sources, e.g two RF emitters. At a point far away from the sources the arbitrarily orientated magnetic field due to source one is: B1(t)=sin(ωt) and source two: B2(t)=sin(ωt+pi) so the total field...

I have a question. If you have two light beams of different frequencies, would you observe interference fringes?

I have this question for my physics assignment. Homework Statement Two plane glass plates 10.0 cm long, touching at one end , are separated at the other end by strip of paper 1.5x10^{-3} mm thick. When the plates are illuminated by monochromatic light, the avreage distance between...

Homework Statement A thin layer of water (n=1.33) is surrounded by air what wavelength of light will not be transmitted through the water at the point where the water is 113 nm thick? The Attempt at a Solution - In phase - Path difference of 2T. - Constructive Interference I just...

Homework Statement Four waves of equal frequency ω are made to interfere. The amplitudes of the first two waves are equal (A), but those of the other two are equal to 2A. Their phase angles relative to that of the first wave are 0, ∏/3, ∏/4, and 2∏/3. Find the amplitude, frequency and phase...

Please Help! Whenever i read standing waves, the interference patten can be seen as attached pictures. I want to know how this pictures can be taken? How lights can be interfered?

I have a very basic question about wave interference and more specifically electromagnetic wave interference. Suppose two beams of light each with amplitude A interfere with the same phase. the amplitude of the resulting beam is 2A. the two beams at the start have powers p= A^{2} each. The...

Homework Statement P15. The police car with its 300 Hz siren is moving toward a warehouse at 30 m/s, intending to crash through the door. What frequency does the driver of the police car hear reflected from the warehouse? (5 marks) Homework Equations doppler shift for an approaching...

For the first question, number 8 i have put up 2 attachment, one with the question the other one with the answer, I am not sure of the answers however, so if someone can check to see if theyre right or not, and if not show me how to attain the right answer. thanks For the next question, number...

The central maxima is of highest intensity and then the successive maximas keep reducing in intensity. Has it got something to do with increasing number of waves which sort of interefere (the word has not been used in the sense of intereference pattern but as a normal english word) with the...

Homework Statement Two identical loudspeakers are located at points A & B, 2.00 m apart. The loudspeakers are driven by the same amplifier and produce sound waves with a frequency of 784 Hz. Take the speed of sound in the air to be 344m/s. A small microphone is moved out from point B along a...

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...