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Questions tagged [wave-particle-duality]

Use this tag for questions relating to the "wave-nature of particles" or the "particle-nature of waves" as they are often discussed in quantum mechanics, where a single object has properties of both classical particles and classical waves.

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How do quantized photons interact in an interferometer?

Since light is quantized into photons, how can a single rare photon entering one side of a large, [say, 100 meter wide], interferometer from a very dim star, a phton which is only in the ...
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change frequency of monochromatic light without altering source?

When light goes from one medium to another its wavelength and velocity change while frequenccy remains the same. Also $E=h\nu$ ie.Frequency depends on energy, Now, given a light beam of given ...
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1answer
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What is “quantized momentum transfer”, and can it account for the double-slit experiment?

In https://www.sciencedirect.com/science/article/pii/S0378437109010401, the author claims that the interference pattern obtained in the double-slit experiment does not need a wave description of ...
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3answers
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Double Slit Experiment : Photon vs Electron

are the following statements correct: For Young's double slit experiment with electrons, the separation between two slits has to be smaller than the position uncertainty of the electrons. But no ...
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Diffraction at the everyday scale [closed]

I know that the reason the wave like nature of matter isnt observerable at the everyday scale is because of how small planck's constant is. But if it were larger, say of the order of $10^2$ such that ...
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0answers
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Heisenberg uncertainty principle - Can a particle be a wave and particle at the same time? [duplicate]

I understand the traditional definition of Heisenberg uncertainty principle and how it is direct consequence of wave particle duality. I am wondering if it is a consequence of the fact that a particle ...
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Question about the diffraction of electrons

This question concerns the diagram on the left. This is the set up. My question is that, why is collector current not an increasing function of the KE of the electrons? I can understand the graph ...
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Why is a maximum value of current observed in Davison and Germer's experiment?

While studying matter waves, we were discussing Davison and Germer's experiment on electron diffraction when we learnt that a maximum value of current (measuring the intensity of electron diffraction) ...
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1answer
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Question about point particle vs. wave equation location

Another uncertainty question, this came up in another forum. As I understand it an electron, for example, is a point-like particle. I take this to mean it exhibits dimensionless properties, but ...
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1answer
47 views

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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1answer
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Is every particle sustained ripple in its respective field?

This is neither a homework nor a calculational question, but more of a conceptual one. I was wondering can every particle; that is, the ones indivisible (because divisible ones can be broken down ...
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Wave-like properties of particles [duplicate]

If we consider a particle such as an electron to have wave-like properties too, what kind of wave it is? What is exactly meant by its wavelength?
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1answer
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Reflection by a mirror of wavelength type dimensions

Suppose there is a perfectly reflecting mirror, which is somehow made to the size of wavelength is visible light. Will there be any reflection now, or will it act in some other way? I thought there ...
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1answer
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Holograms and Entanglement: Does recording an entangled signal in a hologram “observe” the entangled state?

Suppose I have two photons $A$ and $B$, which are entangled. As I have had it explained to me, entanglement works more or less as follows: I observe or measure $A$, and find $A=S_a$, where $S_a$ ...
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Quantisation of radiation energy [duplicate]

I am currently studying about the dual nature of radiation and matter. I have come across how the radiation energy is quantified by saying that it is built up of discrete units. Though I fairly have a ...
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2answers
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Why the cycles completed by standing wave completed by electron in a certain orbit is same as principle quantum number?

According to the bohr model and de-broglie hypothesis why the cycles completed by standing wave completed by electron in a certain orbit is same as principle quantum number? When we derive the ...
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1answer
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When/Why Did Physics Discard The Point Charge As An Accurate Representation? [closed]

Is there anything about the implications of the "early" quantum theory of Schrodinger equation, wave-particle duality, or the two slit experiment that conflicts with the idea of a point charge? Did ...
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Measurement in QM [duplicate]

I understand that measurement collapses the wave function of a particle, but what exactly does measurement mean here? In other words, how is a measurement defined? Does it imply interacting/disturbing ...
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2answers
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De Broglie Wavelength of a particle at the turning point of a fountain

If you think about an atom which is launched in some kind of straight fountain, upward in the gravitational field. At the turning point the velocity and therefore the momentum of the particle seems to ...
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What are the similarities/differences between the behaviors of Quantum particles and bouncing droplets? [duplicate]

Bouncing droplets on a fluid surface show many weird behaviors of the quantum world. Look at this for example: https://arxiv.org/abs/1307.6920 They can show tunneling, double-slit interference ...
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0answers
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Are phase and particle (photon) number in QED conjugated variables?

I found in A. Zee's book "QFT in a nutshell" (1.edition) the interesting relation (8) respectively (9) in chapter III section 5 (p.173) which states that in a collective of non-relativistic bosons the ...
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4answers
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$E=hf$ true for all implies $E=pv$ true for all?

In the answer to this question: Can I apply $E=hf$ to a particle having mass? It was stated that $E=hf$ is true for all particles. If so, doesn't this imply that $E=$momentum x velocity is true for ...
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1answer
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Wave particle duality and gravity

Is a particle's center of gravity at the center of its wave function or is it where we would measure the particle to be? When we measure a particle does its center of gravity shift to where the ...
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1answer
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Does (Tomas) Bohr's modified double slit argument really doom Couder's quantum/classical fluid dynamics analogy?

I'm just an amateur, probably why I find the de Broglie/Bohm/Couder approach to QM compelling. But Copenhagen struck back: in a coincidence, Bohr's grandson is a fluid physicist who claims that ...
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1answer
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Is a light pulse equivalent to a burst of photons

Reading about photons you get all sorts of weird statements like "time is frozen for a photon", "the photon dies the instant it is born" and "the photon is everywhere and nowhere", etc. Probably these ...
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1answer
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How exactly does the intensity of light affect photoelectric phenomena?

We were taught that the intensity of light is equal to the rate of flow of photons per unit area times the energy of each photon(planck’s constant times its frequency) then would that mean the ...
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2answers
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In the double-slit experiment of electrons (observed by photons), is it correct to say the collapse is caused by the momentum of the photons?

I'm working off the article, The Double Slit Experiment Demystified. Disproving the Quantum Consciousness connection. I think it's well-written, but I'm not convinced about this part: So what is ...
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4answers
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In the double-slit experiment, why is it never shown that particles may hit the space between or outside the slits?

In depictions of the double-slit experiment that model the photon or electron as a particle, i.e. when attempting to measure which slit the particle passes through, it always shows the particle ...
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0answers
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Something strange in the quantum Ghost imaging experiment

In his paper, Strekalov, D. V., Sergienko, A. V., Klyshko, D. N., & Shih, Y. H. (1995). Observation of two-photon “ghost” interference and diffraction. Physical review letters, 74(18), 3600., they ...
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6answers
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Wave behavior of particles [duplicate]

When people say that every moving particle has an associated wave, do they mean that the particles will move up and down physically, for example when we say that a moving electron has a wave ...
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3answers
128 views

Are particles and waves separate entities? [closed]

Can this be proven incorrect: Particles and waves are separate entities. Waves are the energy mechanism that transports the particle but not part of the particle itself. If a photon gets created the ...
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1answer
68 views

Quantum tunneling/transmission through an infinite potential

In Shankar exercise 5.4.2 we consider the reflection and transmission of a wavefunction through a delta potential $V(x) = aV_0\delta(x)$. I understand that to mean that the potential is zero ...
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1answer
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Bohm's view of double-slit experiment, wave-particle duality

I gather that Bohm denies the notion that the act of measurement decides whether a photon will be a wave or a particle. Bohm's idea seems to be that the photon is always a particle with a real ...
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What is the wave nature of electron? [duplicate]

Is electron a standing wave or a probabilistic wave? or is it both? can someone explain me also what wavelength we calculate from de Broglie's equation? also does electron spin around itself? or is ...
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1answer
105 views

what kind of information is shared between entangled particles [closed]

when two entangled particles are separate by distance . what exactly happens to them , that influence us to consider they connected each other?
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3answers
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Two in-line double-slit experiment [closed]

Say you have the classic double slit arrangement for electrons with detectors at the slits to determine which slit an electron passes through. Then the electrons will act as particles after passing ...
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0answers
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Are there wavefunctions that don't get more localized as we go backwards in time? [duplicate]

Gaussian wave packets spread as the time passes, which means that as we go backwards in time they get more localized. Therefore, Gaussian wave packets introduce less uncertainty in the position as the ...
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2answers
110 views

Electrons are interfering with what?

In a two slit experiment, We are able to see the interference pattern on the screen even if the apparatus shoots one electron at a time, ie.- there is no way that the electrons are interfering with ...
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1answer
69 views

Reasons behind de Broglie hypothesis

What reasons does de Broglie had when he proposed the idea that electrons behave like waves?
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2answers
109 views

If electrons are waves, how do they repel each other? [closed]

Louis de Broglie said that electrons are waves. But how they repel each other?
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2answers
179 views

What is the frequency of a photon?

During emission spectrum $$\Delta E=h\nu,$$ where $\nu$ is the frequency. All books write that it is the frequency of photon, but photon is a particle and not a wave. More than that what this ...
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1answer
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Is any particle's energy quantized?

In the above picture, the author is trying to summarize the correlation between particle and wave packet. In doing so, he assumes that frequency is related to energy as: $E=h\nu$. Is this apparent ...
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4answers
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If we can say that the probability of finding an electron is 0.9 at point x, how does this tie in with the fact that an electron is a wave?

Shouldn't the electron be everywhere because it is a wave? Or am I wrong, an electron is not a wave? It just has an associated wave function that determines where it might be?
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2answers
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De Broglie Wavelength interpretation

I've just started learning about the double slit experiment (just in the short appendix section in Schroeder's Thermal Physics), and I'm extremely confused by this one thing: In it, out of basically ...
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Would the double slit experiment still yield the same results if the electron were travelling really slowly?

And I mean really slow. I don't know how this would even be done, but just a thought experiment. To explain why I ask this, the way I understand the phrase "we can't know the momentum and position ...
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4answers
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Why do cylindrical waves create an interference pattern (and sphericals do not)?

I have read this: https://phys.org/news/2011-01-which-way-detector-mystery-double-slit.html It says that elastic scattering creates cylindrical waves, and that creates interference pattern, and the ...
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4answers
147 views

Quintuple slit experiment

What would be the outcome of conducting the following modified double slit experiment? Take the normal double slit experiment with a detector on the double-slitted wall, and behind it, add a second ...
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2answers
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Why doesn’t simultaneous wave particle observation collapse the wave function?

My question is pretty much as the subject suggests. Recently Fabrizio Carbonne and a team from EPFL have managed to image the wave particle duality of light. I thought however that this was a ...
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2answers
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What's the significance of the nickel crystal in the Davisson and Germer experiment?

Davisson and Germer, in 1927, conducted an successful experiment to prove the existence of matter waves. What's the meaning of using the nickel crystal? I mean, why didn't they use any other materials?...