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Questions tagged [interference]

Interference describes different waves superposing to form a resultant wave of greater, lower, or the same amplitude. Normally, it involves interaction of waves that are correlated (coherent) with each other, either because they come from the same source, or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, e.g., light, radio, acoustic, surface, or matter waves.

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Why are displacements added algebraically during interference of waves , why not vectorially?

In the diagram (A) , the individual waves are crossing at an angle to each other , so the dispacemnt of the particle at their intersection must have an angle between them , and that must involve ...
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Query about the Michelson interferometer

Say I am cycling past a Michelson interferometer set up. Someone at rest with the experiment will see both beams travelling a distance $L_0$ and hence conclude that $T_{AB}=T_{AC}=\frac{2L_0}{c}$. ...
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Difference between haidager fringes and Newton rings?

What's the difference between a Haidinger fringe and Newton's Ring? I know visually, the central fringe of a Newton ring is dark, whereas the central Haidinger fringe is bright, but what's the ...
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What is the closest distance you can be to two speakers so that the frequency they produce is not audible? [on hold]

The question is given as above. They only give the distance between the two speakers, 8.5 m. I know we have to use the formula where the path difference equals (n-1/2)pi, however, I don't know how to ...
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Diffraction and HUP [closed]

Please help, I cannot find explanation anywhere. Using Heisenberg’s uncertainty principle, give an account of how light diffraction and interference may be treated as a phenomenon based on photon-...
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How to find the fringe width of an interference pattern created by a spherical and a plane wave?

If we have two equations of a spherical and a plane wave (given that the plane wave is propagating along the $z$ direction), how do we find the fringe width of the interference pattern that would be ...
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plane vs diverging waves michelson itnerferometer

I'm wondering if there's a difference in the interference pattern achieved in the michelson interferometer if the source of light is sending plane waves vs sending diverging waves (for example by ...
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Is there an interference pattern formed on the computer screen? [duplicate]

How could explain the the fringes going on the screen? Is it all happening on the camera? Why is it bending as-well? ?
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Calculating total number of fringes in Young's Double Slit Experiment

I know that the $n^{th}$ order maxima can be given by $\frac{n\lambda D}{d}$. But theoretically n can go up to infinity and the intensity will go down. However, is there any way to approximate the ...
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How wide does a door have to be for a cat running through it to interfere with itself? [closed]

A cat runs through a door. Assuming h = 1 J s, mass of the cat is 1 kg, and the velocity of the cat is 1 m/s. Assume the cat is a quantum particle. How wide does this door have to be for the cat to ...
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In the double-slit experiment, why don't slits destroy interference pattern?

In the double-slit experiment with electrons, if a detector is placed in one of the paths to show where the electron is passing, the wave nature of the particle is lost and you have no interference. ...
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Magnetic field in double slit experiment using electron beams

Say I have an experimental setup like this for a double slit experiment using an electron beam instead of light. There is a magnetic field coming out from the plane of paper. So will we get an ...
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How does Destructive Interference redistribute energy?

I have tried looking at the many other questions on a similar topic, however, they don't provide a definitive answer to my question. What I managed to gather so far, is that if a light wave is super ...
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Fringe pattern in Michelson interferometer

It's given that CA - CB is d, the angle CAE is $\theta$. (E is not on the normal of mirror M1). I want to find the condition for maxima at E (as a function of $\theta$). I tried finding the path ...
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Single slit diffraction: Why aren't the interference patterns circles?

A picture of the single slit experiment We were all showed this pictures when started learning about the experiment. I assumed the picture was just a simplified 2D model from the 3D world, and to ...
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When does interference occur at the light?

Electromagnetic waves do not interact in the space with each other, they are in superposition. But why is that the light at the double split experiment interfers, and we have also dark lines, when ...
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Lloyd's mirror problem [closed]

My question is about the reflection of the interference pattern from the screen to the mirror itself in the(Image B), as you can see in the mirror the reflected interference pattern is similar to ...
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“Interaction-Free” measurement involving statistical mixtures

What happens in the standard "interaction free measurement" when the detector connected to a bomb is replaced with attenuation (where light is lost through a semi-transparent medium)? Consider the ...
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Mathematics supporting the classical explanation of why the phase speed of light slows down in a medium

Consider the answer here by Chad Orzel which explains how a monochromatic light can slow down in a medium. He explains, You can think each of the atoms (of the medium) as being like a little dipole,...
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Gravitational waves interference lensing

Is it possible to detect gravitational waves interference pattern in space, using a telescopes alone or a telescope coupled by gravitational lensing?
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How does one deal with 2 waves to view their beats graphically?

Two tuning forks have frequencies of 480 Hz and 512 Hz respectively. The beat frequency should be the difference, which is 32 Hz. Now I want to see this graphically. I modelled these two waves as ...
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Interference patterns of the orbital electron wave functions [duplicate]

I am new to this site so please forgive my initial errors of form or protocol. It has been fascinating to read the many explanations of why electrons don't "fall" into the nucleus and how we need to ...
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Maximum of a sound wave [closed]

I have a question regarding an undergrad problem, and I thought it was going to be easy, but apparently I am missing some key element. The exercise is the question IV-9 of the french Geipi-Polytech ...
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How is it possible that multiple overtones can exist at the same time?

I was wondering how it is possible for overtones to co-exist at the same time. When one pulls a string, it starts to oscillate and forms a standing wave with frequency $$f_0 = f$$ Additionally, ...
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why does the intensity of light does not vary with time in youngs double slit experiment

[ we can see that resultant electric field at a point p is given $E=E0\sin(kx-\omega t+\epsilon)$[equation highlighed with yellow color] as the resultant field varies with time, why not ...
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How does a recordable CD that uses organic dyes to store data produce iridescent rainbow colors?

I thought that only pressed pre-printed CD-ROM can produce rainbow colors due to the parallel spiral tracks of lands and pits it uses to store data in the reflective metal layer, tracks that diffract ...
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Notation question about double slit interference pattern

I know that the conditions for constructive/destructive interference are given by the following equations: $$\text{Constructive:} \space \space \space d\sin{\theta}=n\lambda \\ \text{Destructive: }\...
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In Young's double slit experiment, can you get the deaf spots larger than the loud spots?

I'm trying to get the strong spots, to be very little larger, same size, or smaller, than the weak spots. Is it possible?
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A simple thin-film transmittance calculation problem

I am trying to reproduce results of thin-film transmittance given in this article by using this online thin-film calculator tool (www.filmetrics.com). I would like to use the calculator later for more ...
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Evolution of the operators in Mach-Zehnder interferometer

I have trouble understanding how the operators that change the initial state, change when adding extra splitters. As an example, I will use an idealized Mach-Zehnder interferometer where the splitters ...
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The need for coherent sources for interference

I already know that the pattern created by non coherent sources will constantly change ( from the other answers). I want to understand why this is so My explanation (which I want to confirm): ...
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double-slit experiment showing faster than light information transfer?

In the figure shown below, a laser sends a continuous stream of a large (almost infinite) number of photons per second at a double slit, and the photons are then are displayed on a screen. The upper ...
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can entangled photons produce an interference pattern?

Suppose you have a laser that emits entangled photons in opposite directions towards a double-slit screen setup as shown below. The photons are entangled such that if a photon on the left travels ...
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Why are my interference patterns completely out of phase?

DIY physics enthusiast here doing a double slit eraser experiment at home with a laser pointer, double slit diaphragm, and few linear polarizers (horizontal at one slit, vertical at the other, +/-45 ...
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Does the distance between the slits, in the double slit experiment, affect the pattern displayed?

Does the distance between the slits affect the pattern displayed? I want a pattern where light parts and dark parts are equal, and I don't want the light parts to be bigger than dark parts.
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Gravitational wave behavior [duplicate]

My guestion is since we have now detected gravitational waves can gravitational waves go through interference (ie destructive or constructive interference) with each other like other waves?
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How could we extend Kuramoto Model to Arbitrary Dimensions?

The generalised version of a theory describing synchronisation in an ensemble shows that coherence arises differently depending on whether the number of dimensions is even or odd. But how could you ...
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Distorsion in Photoluminescence

I am studying photoluminescence, but I do not understand why during measurement it turns out that the signal is distorted due to appearance of a long-wavelength replica of the fundamental laser ...
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What happens if separation between slits is greater than separation between slits and screen in YDSE experiment?

I was studying Young's double slit experiment (YDSE) in which it was derived that the formula for path difference ($\delta x$) is : $$\delta x = \frac{y \cdot d}{D}$$ Where $y$ is the vertical ...
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Interference pattern and slit

Three questions about interference pattern and slit. (i) In the 1-slit experiment, an interference pattern is observed if the slit is wide enough (a narrow slit gives a rather blurred interference ...
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Elementary derivation for the minima of the interference pattern in the case of a thin wire without referring to the Babinet principle

For the single slit there is a well known elementary derivation along the following line: If the path difference $\delta$ between the elementary waves coming from the borders of the slit is one wave ...
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Why is intensity decreasing for higher orders of Bragg (x-ray)diffraction?

Bragg diffraction for x-rays by a crystal structure is governed by $$ n\lambda=2dsin\theta ,$$ where $n$ is an integer and the diffraction order, $\lambda$ is the x-ray wavelength, $d$ the lattice ...
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Interference of two wave

We can produce a standing wave by superposition of two waves:one incident $y_1=A \sin{(kx-wt)}$and the other one is reflected $y_2=A \sin{(kx+wt)}$ ; (1)According to my teacher, if the two waves has ...
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Explain why the following conditions should be satisfied for a sustained interference

My Book says that The following conditions should be satisfied for a sustained interference The two coherent sources placed in front of two slits separated by some distance should be close to ...
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What happens to energy when waves cancel out? [duplicate]

So this is basically What happens to the energy when waves perfectly cancel each other? again, but I'm not understanding the answers given (or they don't address what I am confused about) Basically ...
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What type of interference would occur between two frequencies that share the ratio 2:1?

Let's say I have two sine wave oscillations of 200Hz and 100Hz playing at the same time - what type of interference will I observe and why?
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Modified double slit experiment

Imagine instead of an opaqe screen with 2 slits, we have a mirror with 2 slits. Would this produce an interference pattern both on the screens behind and in front of the mirror? We still don't know ...
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What is the basic difference between beats and stationary (standing) waves?

As far as I know both are formed from interference of 2 waves. And why don't the stationary waves undergo destructive interference? It's a bit confusing.
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Why does a green stoplight interfere with FM radio reception (more than yellow)? [closed]

While listening to an FM radio station (frequencies between 88 and 108 MHz) in my car, I've noticed that as I pull up to a red light, there's an increase in the amount of noise. It's very noticeable ...
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Rayleigh Criteriaon of resolution and Angular Separation

I get the Rayleigh criterion for resolution and how that is derived in terms of angle between diffraction maxima’s of the two sources. I read in a book (screen shot attached) that angular separation ...