Tagged Questions
11
votes
4answers
251 views
Are the Maxwell equations a correct description of the wave character of photons?
In basic quantum mechanics courses, one describes the evolution of quantum mechanics chronologically. Interference experiments with particles showed that particles should have a wave character; on the ...
1
vote
1answer
52 views
Is light particle of wave?
We know that Young's double slit experiment shows that light is a wave.
On the other hand photoelectric effect shows that light is made up of photons.
How can light be both at the same time?
-1
votes
0answers
54 views
Question about wave-particle duality [closed]
According to the quantum physics, a particle can exist in both wave and particle at a same time. What is the reason behind this?
I mean what is the source that causes it to show both wave particle ...
0
votes
2answers
83 views
Quantum Mechanical Interpretation of Water Waves?
So I have been exploring the idea of wave-particle duality and came across and interesting idea.
Could water waves, be interpreted as particles in some context? If so, how would you observe their ...
3
votes
3answers
112 views
How can particles travel in a straight line?
A particle can be set off in a certain direction by giving them momentum. Momentum is a vector, so the particle heads off in a specific direction. But the wave function of the particle allows it to ...
2
votes
2answers
80 views
Interpretation of de Broglie wave
Until what point can the de Broglie wave be thought as a real wave?
I mean, is it made of something?
What amplitude does it have? Is it a sine wave?
How can it be related to the wavefunction of the ...
5
votes
2answers
188 views
De Broglie wavelength, frequency and velocity - interpretation
Two fundamental equations regarding wave-particle duality are:
$$ \lambda = \frac{h}{p},
\\
\nu = E/h .$$
We talk about de Broglie wavelength, is it meaningful to talk about de Broglie frequency ...
0
votes
0answers
36 views
Do the other properties of a particle also have a phase?
Particles have a phase that oscillates in space-time. We know this because particles have a phase frequency (De Broglie wavelength) and this is why they interfere in space, like in the double slit ...
0
votes
1answer
47 views
how quantum-mechanical particles react in the potential?
I am reading some materials on quantum mechanics. I am a bit confusing in the chapter on wave-particle duality and following questions arise
In classical mechanics, the force a particle experience is ...
4
votes
3answers
265 views
What is the experiment where subatomic particles appear to foresee the future?
I've seen a documentary, whose name I don't remember but I'm curious because it suggests that subatomic particles are able to "foresee the future".
I'll try to describe it here:
Some particles are ...
15
votes
7answers
1k views
Is the wave-particle duality a real duality?
I often hear about the wave-particle duality, and how particles exhibit properties of both particles and waves. I most recently heard this in this video. However, I wonder; is this actually a duality? ...
2
votes
4answers
1k views
Can an electron be in two places at the same time?
So I've been reading a bit and watching some videos about the double slit experiment, and therefore the wave particle duality; I've also read this "implies" that a particle can be in two places at the ...
0
votes
4answers
194 views
Wave/particle duality
Apologies if this has been asked before (I did check and I believe it wasn't). I have a question about the particle/wave duality of photons (or other particles). Depending on what and how we measure ...
5
votes
4answers
447 views
What does a de Broglie wave look like?
What does a de Broglie wave look like?
Are de Broglie waves transverse or longitudinal?
Can they be polarized?
What about the de Broglie wave of a ground state neutral spin-zero Helium 4 atom?
...
3
votes
2answers
310 views
Matter waves - DeBroglie's relations
I am currently studying from Modern Physics for Scientists and Engineers by Taylor et al. They derive the DeBroglie relation $p=h/\lambda$ from setting mass $m=0$ in the energy-momentum relation ...
3
votes
4answers
331 views
What does it mean (how is it visualized) for a particle to act as a wave?
I have no background in physics. This isn't for homework, just for interest.
In quantum physics, it's described that a particle can act as both a particle and a wave.
Quoted from HowStuffWorks ...
0
votes
0answers
46 views
An idea about the simultaneous observation of wave and particle property of light [closed]
It is well known that in a double-slit experiment with single photon source, one can not obtain the which-way info and interference pattern at the same time, since a detector placed behind one slit ...
2
votes
1answer
113 views
Quantum mechanics and Couder experiments
Couder experiments ( https://www.youtube.com/watch?feature=player_embedded&v=W9yWv5dqSKk and https://hekla.ipgp.fr/IMG/pdf/Couder-Fort_PRL_2006.pdf), published in 2006, state that by dropping ...
4
votes
4answers
744 views
Why does observation collapse the wave function?
In one of the first lectures on QM we are always taught about Young's experiment and how particles behave either as waves or as particles depending on whether or not they are being observed. I want to ...
9
votes
4answers
646 views
Does the uncertainty principle apply to photons?
Wikipedia claims the following:
More generally, the normal concept of a Schrödinger probability wave function cannot be applied to photons. Being massless, they cannot be localized without being ...
3
votes
1answer
113 views
Determining the spin of wavefunction
We all know that by uncertainty principle, location of a wave-particle is perfectly determined when uncertainty of momentum becomes infinite. (I also heard that in reality, it is almost impossible to ...
1
vote
1answer
266 views
Photons and uncertainty principle
Let's assume we have a perfect single-photon source: a device emitting exactly one photon at a time, with defined energy and direction. Let's shoot a photon: we know exactly the position of the photon ...
6
votes
4answers
356 views
$\lambda=\frac{2h}{p}$?
I am studying quantum physics and there is something I don't understand:
I know that for any particle $E=hf$ (Einstein relation) and $v=\lambda f$ ($v$ is the speed of the particle).
I also know that ...
1
vote
1answer
142 views
electrons in an atom and uncertainty principle
Electrons in an atom have quantized energy quantity. Can uncertainty principle be applied in this case, then?
How does this work?
As energy is fixed, this seems to disobey $\Delta E \Delta t \geq ...
0
votes
1answer
305 views
Momentum in quantum mechanics
In quantum mechanics, we can have some superposition of matter waves that have different wavelengths. If then, can't momentum of a particle change every time measurement takes place? Or should I ...
3
votes
1answer
269 views
wavefunction collapse and uncertainty principle
We all know that wavefunction collapse when it is observed. Uncertainty principle states that $\sigma_x \sigma_p \geq \frac {\hbar}{2}$. When wavefunction collapse, doesn't $\sigma_x$ become $0$?, as ...
2
votes
5answers
222 views
wave superposition of electrons and quarks
Is quantum wave superposition of electrons and quarks possible?
If not, can different types of elementary particles be mixed in wave superposition?
4
votes
5answers
451 views
What do we actually mean when we say that matter is a wave?
What do we actually mean when we say that matter is a wave?
What does the wavelength of this matter wave indicate?
The idea of a particle behaving like a wave is kinda incomprehensible to me.
...
1
vote
1answer
98 views
Matter wave of multiple particles of different types
I am slightly getting confused on the following issue:
When performing double-slit experiment of electrons, a screen allows the matter waves to be detected as particles. And as we all know that ...
0
votes
0answers
89 views
neutron velocity selector and rotational speed of shaft [closed]
Suppose that there is a beam of neutrons with a range of wavelengths. One intends to produce neutrons of single wavelength by the use of neutron mechanical velocity selector.
The question is, if the ...
2
votes
1answer
130 views
Deducing from the double slit experiment that electrons mostly behave like particles
I saw this video of a lecture by Feynman where he said that electrons behave like particles when there is a photon source to detect which slit they pass through. Does this imply that electrons mostly ...
3
votes
2answers
149 views
Which equation tells you the minimum energy of a wave needed to see a small particle?
I have a problem that asks for the minimum energy of a wave that we will use to see a particle of size $.1\text{ nm}$. I understand that I can not see a $.1\text{ nm}$ particle with any wave length ...
2
votes
1answer
347 views
How can a Photon have a “frequency”?
I picture a light ray as composed of photons with an energy equal to the frequency of the light ray according to E=hf. Is this the good way to picture this? Although I can solve elementary problems ...
1
vote
2answers
218 views
matter wave and wave function
Is there any mathematical relationship between matter wave (or de Broglie wave) and wave function?
Also, does each type of particle (e.g. photon, electron, positron etc.) have its own unique wave ...
3
votes
4answers
175 views
slit-screen and wave-particle duality
In a double-slit experiment, interference patterns are shown when lights pass through slits and illuminate the screen. So, the question is if one shoots a single photon, does the screen show ...
1
vote
4answers
442 views
Questions on wave-particle duality
Wave-particle duality states that a particle has both wave properties and particle properties when one is not observing it.
1) What is an observer? Need it be anything living or can other particles ...
5
votes
3answers
565 views
Electrons - What is Waving?
If an electron is a wave, what is waving?
So many answers on the internet say "the probability that a particle will be at a particular location"... so... the electron is a physical manifestation of ...
4
votes
3answers
359 views
Young's experiment or why the light can't be described as a particle [closed]
Who hasn't heard about the double-slit experiment? It figures in any book of quantum physics. But there is something no one can explain to me : I understand why the light cannot be described only as a ...
