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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Can the frequency of a wave change with respect to distance? Is there any phenomenon, or wave properties which can achieve this?

Want to know if the frequency of wave can be changed with respect to distance, is it possible either by using multiple interfering waves or any other way?
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Interference of refracted waves

I was going through the theory of propagation of radio waves through the ionosphere. In the literature, it is widely believed that the radio waves sent from a satellite towards a receiver on earth ...
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Thin-Film interference confusion

While studying thin-film interference on wikipedia, I encountered a problem. The picture in the link shows a colorful pattern formed on the oil film, that is, the oil film also acts as a screen on ...
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Expression for maxima in single slit diffraction pattern by dividing the slit into zones

A common way for deriving the expression for the minima in a single slit diffraction pattern involves dividing the slit into even number of zones and pairing up the wavelets so that they cancel out ...
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Why does interference pattern remain constant?

In the double slit experiment we have something like this Light waves from two sources interfere at screen to give us this pattern. To reach the middle (that is a point on the perpendicular ...
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What happens to the energy when two waves completely interfere destructively? [duplicate]

this question has been asked many times and none seem to completely answer or i am unable to understand the answers So let us consider two mechanical transverse waves traveling in opposite directions ...
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Why do we use an eyepiece to view the fringe pattern in a fresnel biprism experiment?

Why do we use an eyepiece to view the fringe pattern in a fresnel biprism experiment? Cant we see the fringe pattern through naked eye? What is the theory behind all this? And what is the difference ...
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When two waves undergo complete destructive interference then what happens to the energy of the two waves? [closed]

https://physics.stackexchange.com/q/23953 Here the author of the answer mentions that complete destructive interference acts as a mirror . As the potential energy of the ...
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Colored fringes in optics

What optics principle is responsible for the colored fringes seen in the attached picture?strands of hair reflecting sunlight when held very close to the lens[]1]1
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Wave Interference (Control Tower vs Mobile Phones)

I was curious about something regarding radio waves. When we're talking about differences of 200 MHz between waves, is there any way of any noticeable interference occurring? By noticeable I mean ...
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Is it really necessary to use laser as a source of light in Lloyd's mirror?

After learning about Lloyd's mirror from Wikipedia, I watched a video demonstration of the experiment in YouTube where a laser was used as the light source. In Young's Double Slit Experiment (YDSE), a ...
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Shape of fringes in YDSE (with slits)

In Young’s double slit experiment, I have been told that when we use slits, each point acts as a point source of light, and thus we get straight fringes. I’m aware that when holes (very small holes) ...
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How energy is conserved in destructive interference of plane waves? [duplicate]

Let us consider two plane waves of same amplitude and frequency but having 180 degrees phase difference.Both the waves are having energy E in them which is directly proportional to the square of the ...
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Why do the distances between the fringes depend on the wavelength? [closed]

In the double-slit experiement, with the monochromatic light, the longer the wavelength, the more the distances between the fringes. Can somebody explain why?
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What exactly does “antiphase” mean?

I'm trying to understand the principle of active noise control, a technique to reduce noise by using interference. Wikipedia says: A noise-cancellation speaker emits a sound wave with the same ...
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Double slit experiment on buckyballs

Whenever we have a "macro" object like a buckyball, it has many electrons and quarks if not something more fundamental, all of which have their own wavefunctions that interact with each other. But in ...
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Can physical spaces 'resist' certain sound frequencies?

I whistle a lot, and I'm fairly decent at it. Recently I was walking up the stairs in a house while whistling. As I whistled, I found it difficult to hit a specific note in the song that I would ...
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Why is the next minimum $\lambda$ from central maximum in the derivation of the Rayleigh criterion for a diffraction grating?

I am struggling to understand part of the derivation for the Rayleigh criterion, which states that "Two images are just resolvable when the center of the diffraction pattern of one is directly over ...
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Optical Flat Interferometry for Flatness Measurement?

I am trying to understand how optical flats are used to measure the surface flatness of an optic. Background See this image from Edmund Optics note on optical flats. In this image I will point out ...
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In wave optics when light ray interfere constructively then from where the value of $n$ in “$n$$\lambda$ ” starts (from 0 or from 1)

In the given solution why we have taken value of $n$ =1. Why don't we take $n$=0. On taking $n$=0, it gives a negative value of $h$. I think this is the reason we have taken $n$=1 instead of $n$=0. ...
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If the $E$ component of an EM wave interacts with another $B$ field (from other source), can they generate Poyting vector (or photon flux)?

As shown in the figure, a planar EM wave propagates in the $z$-direction, and its electric component is in the $x$-direction. Meanwhile, in the whole region, there is a static magnetic field B ...
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Methods of delibirately patterning a thin film interference pattern on glass

I'm not sure if this question is too much of an applied physics question for this platform. If so, my apologies, consider it not asked :) I'm wondering if there are any existing techniques to create ...
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Deny of wave nature of matter [closed]

I have encountered a particle physicist saying that the wave nature of electron doesn't exist and the wavefunction just gives the probability of finding the electron in a particular position. Click ...
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Angular separation of the lines in a diffraction grating problem

This question is about using a diffraction grating to view the emission spectrum of sodium. Light from a sodium discharge tube is incident normally upon a diffraction grating having 8.00 x 10^5 lines ...
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How did Newton explain the effect we now call Newton's Rings? [duplicate]

I'm trying to understand how Newton formulated his corpuscular theory of light when he was surrounded by evidence of light's wave-light properties. Specifically, the effect that we now call Newton's ...
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4answers
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What to find the path difference in constructive interference?

Hi there, I am unsure of how to calculate the path difference in questions relating to constructive and destructive interference. I understand that when two waves are exactly in phase with each ...
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Energy on destructive interference [duplicate]

Where does the energy go when there is destructive interference between two waves of light which are equal in amplitude? As we know energy can neither be created nor destroyed. Then the energy ...
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How does an interference pattern change when the width of a single slit is widen?

It came about when discussing Young's double slit experiment, that in order to get a double slit interference pattern during his time, he had to first place a single slit screen in front of his double ...
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Quantum mechanics Interference [closed]

While learning wave-particle duality of an electron I found the wave with which we associate the electron is the probability wave. Now my questions are that if that is so How do electron show ...
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1answer
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Linear Polarization of Single Photon?

I've heard it said (a while ago) that we don't usually speak of a single photon being linearly polarized or unpolarized, but rather we can speak of an ensemble of photons that are linearly polarized ...
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1answer
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Physical significance of the ket vector

I'm trying to understand/form an intuition for why a ket-vector, and its associated bra-vector, are appropriate tools to represent the spin of a qubit. Generally speaking, if a system has a state/...
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1answer
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Why does the soap bubble shine with the colours of the rainbow?

Is it because of refraction of light in water? a mixture of UV rays in sunlight? polarization of reflected light? interference of light reflected from external and internal film surface? or maybe ...
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Does the spectrum of two-beam interference also show an interference pattern?

I know when you interfere two beams you get an interference pattern with a fringe pattern of λ/(2*sin(θ/2)) in physical space. It seems that there must also be modulation of the spectrum. Is this ...
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Tilted screen in Young's double slit experiment

I was wondering what would happened if we titled the screen in Young's double slit experiment (YDSE) by a certain angle say $\theta$. What effect would it have on fringe patterns and their intensities ...
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1answer
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In Young's double slit experiment, does the intensity of light depend on the slit width?

Here's a question I just came around In YDSE, the intensity of the maxima is I.If the width of each slit is doubled, what will be the intensity of maxima now ? here, we assume that no diffraction is ...
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Why won't my interference pattern go away?

Bought a double slit diaphragm, laser pointer and some linear polarizing sheets off of Amazon so I could see the double slit experiment first hand. When I place a vertically aligned polarizer in ...
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1answer
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Strange behavior of a light bulb?

What are these wave-like moving black areas shown in the following gif? Why do they start to appear when the exposure (or brightness) gets lower than a certain point? Why do the frequency and the ...
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1answer
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Error due to assumptions taken to derive the formulae for interference pattern in young's double slit experiment

The screen is far away. So we assume w/D << 1 where w is the distance between the slit and D the distance between screen and slit. But if this assumption bring about error which is comparable to ...
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electron double slit experiment manipulating interference pattern

Let us suppose we can change the magnetic field and the charge on the interference surface like shown in the picture. Would it be possible to move our interference pattern along the y-axis by changing ...
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Superimposed Waves

This question has been bothering me for a very long time. Imagine a wire carrying electric current. It carries two alternating current (AC) signals of different frequencies (say $50$ Hz and $60$ Hz). ...
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What happens when two opposite EM waves which completely destructs each other hits a wall? [closed]

I have always wondered what happens when two opposite EM waves which completely destructs each other hits a wall? Does it reflects back or does it go through it. Would be good if anyone could give a(...
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Double slit diffraction and interference patterns

i'm a highschool physics student trying to understand diffraction and interference etc. I'm confused about this (in the context of the double slit experiment): if an underlying interference pattern ...
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1answer
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Path difference that is between 0 and 0.5 or similar [closed]

A question in a new physics textbook we are using in school tasks readers with determining the path difference and them commenting on whether it would result in constructive or destructive ...
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1answer
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Fringe spacing of the Interference pattern due to two in-falling coherent waves

It has been a long time since I have dealt with these kinds of interference/fringewidth problem, I cant figure out a way to start solving this problem. I was thinking about what the spacing between ...
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Interference using three slits

Lets say there is a Young double slit interference apparatus, but with three slits placed at $y= - d$, $0$, $d$, and where the screen is at $X = D$ parallel to the $y$ axis. Can there be any areas on ...
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Why do the LINES in a vertical soap bubble get thinner as we go down?

I understand that the soap bubble gets thicker at the bottom of the bubble due to gravity, resulting in a complicated array of different colors of different wavelengths being constructively and ...
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Quantum Interference Pattern with Perpendicular Sources

Imagine that there is a photon detector in front of me. Also imagine that there is a test photon traveling from my left to my right. As this test photon passes, I fire other photons right at the ...
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2answers
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Do noise-cancelling headphones make a lot of unheard noise?

The way noise cancelling headphones work is by listening to sound, and created the inverted sound to 'cancel it out'. Doesn't this mean that the headphones create double the amount of noise, but our ...
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When two photons annihilate each other through destructive interference, where does the energy go? [duplicate]

When two photons annihilate each other through destructive interference, where does the energy go? Perhaps this is only answered by ‘wave type’ questions and answers? Does the conservation of energy ...
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Multi electron interference in double slit experiment

Electrons have negative charge, and therefore repel each other. That should mean that their position, and momentum probabilities should get skewed away when in the presence of some other electron. I.e....

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