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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 does classical physics not predict particles in the double-slit experiment to land in just two different locations?

I stopped being able to understand the double-slit experiment way before any of the interference and associated "quantum weirdness" came into play. I get that one needs to approach this ...
Martin Drozdik's user avatar
1 vote
3 answers
52 views

Mach-Zehnder interferometer and superposition

I've a doubt on interpretation of superposition in the interferometer Is it correct to say that in the Mach-Zehnder interferometer, the photon exists in a state of quantum superposition of the two ...
daniele's user avatar
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4 answers
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Observation in Young's double slit experiment [duplicate]

I'm new to YDSE and recently I found out that there was also an experiment done when humans were able to separate photons (What I mean is we were able to shoot photons onto the double slit) so it was ...
Neel's user avatar
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0 answers
9 views

Jamin interferometer's interference pattern

I'm working with a Jamin interferometer, and I'm interested in calculating the intensity pattern I would observe in a far away plane. The scheme is as follows: Spherical light enters through the ...
Lagrangiano's user avatar
5 votes
4 answers
1k views

Double slit experiment with polychromatic light

When double slit experiment is carried with white light , the resulting pattern on the screen is predicted by assuming white light as combination of light of different colors. Then it is assumed that ...
Users's user avatar
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4 answers
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Why interference is happening with two slits but diffraction is happening with one slit?

why interference is happening with two slits but diffraction is happening with one slit? In the case of interference diffraction also happens but not the other way around? Why so?
Rick Andy's user avatar
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10 votes
3 answers
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Why is intensity additive?

In class we came across a problem that is essentially the following: Suppose a source of sound has an intensity of 70 dB. Suppose 9 additional sources produce the same sound in unison (so 10 ...
Marcus A's user avatar
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Double slit with off centre source, where does phase difference occur?

I am currently working through the following problem for my optics class. The setup as shown below is composed of a double slit sandwiched between two convergent lenses L1 and L2. A point source is ...
Hervé Schmit-Veiler's user avatar
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1 answer
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Impact of obstacles on Single/ Double split interference pattern

What is the impact of obstacles on the interference pattern if the obstacles are arranged to be located in the destructive interference locations as follow: According to my understanding to classical ...
Wael Khatib's user avatar
0 votes
1 answer
28 views

Beam splitter using a lazer to do the splitting

My title may be misleading, and my question is definatly amateur. I would like to split a beam of light, with a second beam. I suspect this may not be possible (or only possible with large amounts of ...
Robert Diamond's user avatar
2 votes
1 answer
78 views

Question on Babinet's principle example

Say we have the following mask (I drew it myself on paint): I asked myself if it is possible to know the form of the image generated on a screen after the mask or know the electric field generated ...
Ivy's user avatar
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Why in the experiment of double slits, in case of radiation of wavelength of red light, we can observe an envelop of the minimum?

I have made an experiment in which i have to measure the intensity of the light generated by an $\text{He-Ne}$ laser, in the case of two slits, I pretend to observe an interference lattice. I have to ...
Matteo Saba's user avatar
1 vote
0 answers
39 views

Self-interference of nuclear decay

Consider a stationary atom undergoing radioactive decay. The probability density function for decaying at time $t$ is given by an exponential distribution: $$p(t)=\lambda e^{-\lambda x}$$ When ...
Riemann's user avatar
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1 vote
1 answer
50 views

Applying Fermat's principle in Fraunhofer's diffraction

The following set up with a source, 2 convex lenses, a slit and a screen is of that of Fraunhofer's diffraction: *Correction S is not on the common optical axis, but above it. $\theta$ = Angle ...
soccerer's user avatar
3 votes
4 answers
211 views

Does QM recognise empty waves?

If a particle (photon) goes through a Mach-Zehnder interferometer it is accepted in quantum mechanics texts that in passes in both channels after first beam splitter BS1 and propagates there until BS2....
Mercury's user avatar
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2 votes
2 answers
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Many-Worlds Interpretation: What Ensures Every Physically Possible Scenario is Actualized in Some Parallel Universe?

In the Many-Worlds Interpretation of the Mach-Zehnder Interferometer experiment, one interprets the universe as splitting into two, with photons traveling in different directions in each universe. ...
Tarun Gupta's user avatar
1 vote
2 answers
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What is the upper limit of size for diffracting an object?

All items in the universe can be said to have a De Broglie wavelength which is significant if that wavelength is comparable to the object's size (I don't have to worry about my wavelength diffracting ...
EngineeringMind's user avatar
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0 answers
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Is the $n=0$ antinodal line in a double slit experiment constant loudness at all points?

If we assume a normal double-slit experiment with two speakers that produce identical sound waves, is the $n=0$ antinodal line going to have a consistent loudness wherever point on it? As the crest ...
Woo Luke's user avatar
6 votes
4 answers
951 views

Treatment of infinite reflections in thin-film interference

Why do we only consider interference of the first two reflected waves when studying thin-film interference (see attached diagram)? Is there a rigorous treatment that considers the infinite number of ...
antoine's user avatar
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1 vote
3 answers
200 views

Diffraction grating from reflection

We had an experiment in our physics lab where we used two grating materials one with 2500 lpi(say A) and the other with 15000lpi(say B). Now when we shine white light on both of them we didn't get any ...
Ankit's user avatar
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2 votes
4 answers
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Diffraction proof

I am talking about the way we generally explain the occurence of bright and dark fringes during diffraction. When we want to show a dark fringe we consider a pair of secondary light sources who have a ...
Shivam Agarwal's user avatar
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0 answers
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Destructive interference of Gravitational Waves and the Conservation of Energy

Destructive interferences are interesting for a physics student, specifically when checking the Energy Conservation. In the case of destructive EM waves or String waves it is easy to understand where ...
TheFyziker's user avatar
1 vote
0 answers
26 views

Interference of wave on string [closed]

Can somebody explain how the sinusoidal wave will cross the junction, meaning what will be the intensity and amplitude during and after the crossing? Assuming constructive interference at the second ...
Saksham Garg's user avatar
1 vote
3 answers
89 views

Relation between classical probability and quantum probability formulae

Assuming superposition state $$ \Psi = C_1 \psi_1 + C_2 \psi_2 $$ ,one can write the expectation value $\langle A \rangle$ of a physical magnitude A as follows $$ \langle A\rangle = P_1 \langle A\...
Takopako's user avatar
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1 answer
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Why does quantum random walk show ballistic transport?

For the topic of quantum random walk, a simple example is considering a 1D lattice fermionic model, expressed as $H = \sum_{i} c_i^\dagger c_{i+1} + h.c.$ Assuming there is one fermion located at the $...
JohnWu's user avatar
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0 votes
4 answers
86 views

Single Photon Interference and the Hong-Ou-Mandel (HOM) Effect in an Interferometer

Reading on the Hong-Ou-Mandel (HOM) effect, I came to wonder how exactly we can be certain that interference that occurs in apparatuses such as a Michelson interferometer and Mach-Zehnder ...
OneStrangeQuark's user avatar
0 votes
2 answers
104 views

Why diffraction works at sharp edges?

While introducing Diffraction, physics textbooks say that this effect (Diffraction) is observed distinctively when the light is passed through a very small opening, the length or diameter of which is ...
Devansh Mittal's user avatar
0 votes
2 answers
61 views

Is the Huygens' principle consistent for intersecting wavefronts?

When refraction takes place at the interface of two media, wavefronts can be extended to intersect as below: At point of intersection, light requires no time to travel between the wavefronts. However,...
worksifitdoes's user avatar
0 votes
1 answer
50 views

How to align a Mach-Zehnder at 810 nm?

I have a task to arrange MZI using very weak source with photons coming one at a time. On top the wavelength is 810 nm. How to 'see' the interference pattern to 100% in one channel and 0% in other. I ...
Mercury's user avatar
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0 votes
1 answer
47 views

What are the disadvantages of using a single mode Fabry-Perot laser diodes in interferometry, as opposed to distributed feedback laser diodes?

What are the disadvantages of using a single mode Fabry-Perot laser diodes in interferometry, as opposed to distributed feedback laser diodes? I'm specifically interested in potential problems that FB ...
Jimski's user avatar
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1 answer
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A question related to Newton's Rings (SOLVED)

I was solving this question, I arrived at the correct answer which is 'A' the reason 'C' and 'D' are incorrect is cuz the fringes would eventually converge as if we look at this question from another ...
Gauransh's user avatar
1 vote
0 answers
30 views

Why do light bulbs don't produce coherent waves? [duplicate]

My textbook says that light ways produced by light bulbs are not coherent but it doesn't describe the reason. I was wondering how could two waves not be coherent regardless of the source they are ...
Muhammad Ali's user avatar
-1 votes
1 answer
48 views

Electron Interference when produced by $W$ boson

Hi I was wondering about the following setup. Let’s say we have a radioactive atom which decays via beta decay which produces a $W$ boson. The $W$ boson has a chance of turning into an electron or a ...
EigenDragon16's user avatar
0 votes
1 answer
57 views

Where does the diffraction equations work and why?

w = fringe spacing $\lambda$ = wavelength D = horizontal distance between slits and screen s = slit spacing d = slit spacing $\theta$ = angle between central maximum and the ray at the nth maximum $\...
Devil's Advocate 2321's user avatar
0 votes
1 answer
39 views

Mach Zehnder Do-it-yourself

I have a red laser and BS. Can I make MZI at the lab? I heard that is very difficult to achieve the calibration. What is expected to be seen after BS2? A dark spot at centre with fringes around? I ...
Mercury's user avatar
  • 651
1 vote
4 answers
81 views

How monochromatic waves can be incoherent?

Is it possible to have a monochromatic wave which is incoherent? On the one hand, it could be obtained by irradiating a laser beam on a strongly scattering medium like white paper. But on the other ...
mati5's user avatar
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0 votes
1 answer
63 views

How is the interference pattern of the double slit experiment quantitatively measured? [closed]

The single photon / single electron double slit experiment shows particles appearing as dots on the screen. This is explained as being due to the collapse of their wavefunctions. However, if they were ...
Blacklight MG's user avatar
1 vote
1 answer
33 views

Can a CCD work in time integration regime?

Can one use a CCD in same way as photosensitive paper? When one has very low intensity like in single photons double slit experiment to see the interference pattern one puts a photosensitive paper at ...
Mercury's user avatar
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3 votes
6 answers
1k views

How come two electrons interfere?

This is something I have read many times that the double slit experiment done with electrons produce the same pattern that we get with light i.e. the electrons undergo superposition similar to that of ...
Ankit's user avatar
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0 votes
0 answers
28 views

Modelling incoherent sources

Suppose some (coherent) light propagates onto a one-dimensional barrier with two open slits, each of length $\delta$ and separated by a distance $s$ (we can assume the centroid is known and placed at $...
Balter 90s's user avatar
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0 answers
23 views

How to find the wavelengths of sources?

I have the resulting interference field (the intensity at each point in the field is known) from several radiation sources. How can I find the wavelengths of the sources? The coordinates of the ...
xayam's user avatar
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-2 votes
1 answer
74 views

Path lengths in the dual slit experiment and the speed of light

In the dual slit experiment, we can view the diffraction pattern as the constructive and destructive interference of two waves from the superposition of a single photon. If we analyse the paths ...
KDP's user avatar
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0 votes
0 answers
27 views

How does squeezed multimode light, where the modes are entangled, behave in a beamsplitter?

I understand how to work with and describe squeezed single modes going through a beamsplitter, and can conceptually talk about what's happening. If I now take a source of squeezed light that has ...
compp's user avatar
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-1 votes
3 answers
70 views

Simplest experiment to see quantum interference of $|HH \rangle + |VV \rangle $?

What is the simplest experiment that I can perform to see interference of $|HH \rangle + |VV \rangle $, assuming this is an entangled state of two photons in two different polarizations? Ideally I ...
Steven Sagona's user avatar
2 votes
1 answer
75 views

Intuition behind Huygens' Principle?

I have recently started learning about physical or wave optics and one of the initial topics is Huygens' Principle. One part of Huygens' Principle states that every point on the wavefront acts as a ...
Spluesh's user avatar
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0 answers
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How to eliminate polarization mismatch in the Michelson interferometer based on single-mode optical fiber?

We are developing a mobile system for optical coherence tomography based on fiber optic Michelson interferometer. We are facing a problem of chenging the polarization during a movement of the fiber. ...
Victor Legkostup's user avatar
0 votes
3 answers
156 views

Interference in single slit

In my point of understanding, interference is produced when waves from two sources of light (may be coherent or non-coherent) overlap resulting in consecutive bright and dark fringes on a screen. But, ...
Vinay5101's user avatar
0 votes
3 answers
229 views

Clarifications on interference of waves

Here is my understanding: Superposition describes the effect of two waves, of the same type, coinciding at a point, stating that the resultant displacement is equivalent to the vector sum of the ...
Quin Gardiner Bax's user avatar
1 vote
0 answers
33 views

Where does the energy go when two waves destructively interfere? [duplicate]

Suppose two wave pulses are traveling in opposite directions, but when they superimpose, they completely cancel each other out (destructive interference) But as soon as they pass each other, they just ...
Spluesh's user avatar
  • 61
2 votes
1 answer
288 views

Will the interference pattern still be observed with gamma rays in double slit experiment?

I am little confused. Please correct me if I am wrong. Gamma rays can produce electron and positron pair if they interact with atoms. In the double slit experiment the final screen where interference ...
SacrificialEquation's user avatar

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