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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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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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Has anyone tried the double slit experiment with materials of different densities?

I'm not able to find a study with the following set up so if anyone is aware of such a study please let me know Test: Do micro gravitational fields influence particle trajectory? Setup: Double slit ...
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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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Wavelength and slit width effect on single slit diffraction

You are photographing a single-slit diffraction pattern from monochromatic light. How would your pattern differ if the wavelength were doubled? If the both the wavelength and slit width doubled at the ...
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A question based on Youngs Double slit experiment [on hold]

In YDSE experiment the distance between the two slits is d and the distance between the slits and screen is 2d. The wavelength of the light used in this experiment is λ such that the first minimum is ...
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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 ...
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Sawtooth synthesis using random harmonic phase

I was experimenting with Octave and NumPy/SciPy by synthesizing (reverse) sawtooth waves and decided to find out what a sawtooth comprised of harmonics with arbitrary phases would sound like. Note ...
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What is the interference pattern?

Imagine three coherent monochromatic waves as depicted in the image. Say we are interested in the interference at a very distant point P (not depicted). As one can see, B will interfere destructively ...
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Why does collimated light form an airy disk pattern on a camera sensor?

I'm using a Raspberry Pi camera v2.1 (lens removed) to make some observations on a laser. I have the laser coupled into a single-mode fiber which outputs a smooth gaussian spread onto the camera. From ...
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What happens to the pressure time graph when two musical instruments play at the same time?

I'm learning acoustics for the first time and I'm having trouble picturing what the pressure time graph would look like when two instruments play together. https://newt.phys.unsw.edu.au/music/flute/...
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Interference of counter propagating beams

I am trying to build an optical system where a thin glass plate is illuminated by two mutually coherent beams E1 and E2 (sketch is below). My question is: Do I get an interference pattern on the ...
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Altering Young's double slit experiment due to observation

The interference pattern on the screen is altered due to our observation, but how could this happen, as we have been watching it since we started the experiment? Is there any other meaning of '...
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Why doesn't optical path difference occur when light from two coherent sources pass through a lens?

I guess, for a convex lens I might say that the marginal rays travel a longer path but spend a shorter time inside the lens, while the opposite of that happens in case of paraxial rays. That can be an ...
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Intensity of fringes in a Double Slit experiment

I have learnt that the intensity of fringes in a double slit experiment depends on the following formula: $$I = 4i\cos^2(\delta/2)$$ But it turn out that the intensity of th consecutive fringe ...
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Is there a name for this wave effect?

So I was using this wave simulation (https://phet.colorado.edu/sims/html/wave-on-a-string/latest/wave-on-a-string_en.html) when this happened; using the settings: Oscillator, High tension, no damping. ...
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Does interference pattern depends upon the material used to make slits?

Is the interference pattern independent of the material from which the slits are made or is it dependent upon the type of material in some way?
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Explanation of formation of Newton's rings

I was asked to do a lab report in my University about Newton's rings experiment that we made in lab. I understand that the aim of the experiment is to measure the wavelength of a light after the ...
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Double slit experiment- light intensity

The standard explanation for the interference pattern is one of constructive and destructive interference between the light waves from the two slits. But, am I right in thinking that light intensity ...
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Interference of Schrödinger's Cat states?

A "Schrödinger's cat state" is a macroscopic superposition state. Quantum states can interfere in simple experiments (such as the Mach-Zehnder/Hong-Ou Mandel/etc). Can Schrödinger's cat states be made ...
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Constructive interference derivation

What is the difference between using $y=A\sin\omega t$ and $y=A\sin(ct-x)$ in a wave formula? I am not a math student and I am not getting this.
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YDSE - coherence of light from slits and width of slits

In Young's double slit experiment, 2 slits act as coherent sources. Why is coherence lost when the width of the slits is greater than half of the fringe width, i.e, if slit width is greater than the ...
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Huygens Principle and Interference

If Huygens Principle states that every point on a wave acts as a source of secondary wavelets, then: Is the new wavefront formed by the interference of these secondary wavelets? If so, then how can ...
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Is the resultant intensity in case of constructive interference always 4 times?

I get that intensity is proportional to square of ampltude and hence if two waves of same amplitude meet in phase, it results in 4 times intensity. But they need not have the same ampltude. One can ...
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Where would interfering rays of light produce an image?

I have a question about where the image would show up in this case. If the observer were at point A, and the rays labeled red and blue were to interfere at the observer, where would the image appear? ...
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Interference of coherent electromagnetic waves in two dimensions?

Interference of two coherent but mutually perpendicular electromagnetic waves whose electric field vectors are given by $$E_{1} =E_{0} \cos (\omega t) \widehat{i} $$ $$E_{2 } =E_{0} \cos (\omega t ...
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Can interfering rays of light be non-coincident?

I'm trying to figure out how thin films work when they're not flat. In a vertical soap film, for example, the film is thicker at the bottom, being pulled down by gravity. My question is whether ...
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Principle of interference between two waves of same wavelength

We have two waves with the same wavelength that have a path difference. Why does the path length difference have to be an integer multiple of the wavelength in order to obtain constructive ...
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Bragg diffraction form an “inclined” crystal plane: which angle to consider?

Consider Bragg diffraction form an "inclined" crystal plane (i.e. not perpendicular to the normal of the crystal). I was sure that the angle of diffraction $\theta$ in bragg's law must always be ...
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A Problem About Multi Slit Interference

To my understanding,in multi slit interference, 2 equations are correct. $n*\lambda=d*sin(\theta)$ and $S=(\lambda*D)/d$ In the problem below, however, the 2 equations gave different solutions. I hope ...
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A Question About Thin Film Interference

I learn in high school Physics class that when light travels from a medium to a more optically dense thin film, then the reflected rays will destructively interfere with each other. My questions are: ...
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Global destructive Interference and conservation of energy

As an engineer I see it like this. Imagine I send a wave and then I send another wave in phase shift to cancel that wave. Unless I am sending the wave from exactly the same point in both instances, ...
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What is the interaction of gravitational waves?

Please excuse my lack of knowledge about the subject but, If gravitational waves travel thru the fabric of space time do they interact with each other? Meaning do they create interference patterns ...
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Can two semi-infinite plane waves undergo perfectly constructive interference?

This is building off of a question I asked here. When discussing the linked problem with some friends, the consensus seemed to be that the reason two identical semi-infinite plane waves cannot ...