What is Particles: Definition and 1000 Discussions
In the physical sciences, a particle (or corpuscule in older texts) is a small localized object to which can be ascribed several physical or chemical properties such as volume, density or mass. They vary greatly in size or quantity, from subatomic particles like the electron, to microscopic particles like atoms and molecules, to macroscopic particles like powders and other granular materials. Particles can also be used to create scientific models of even larger objects depending on their density, such as humans moving in a crowd or celestial bodies in motion.
The term 'particle' is rather general in meaning, and is refined as needed by various scientific fields. Anything that is composed of particles may be referred to as being particulate. However, the noun 'particulate' is most frequently used to refer to pollutants in the Earth's atmosphere, which are a suspension of unconnected particles, rather than a connected particle aggregation.
Hello! This is my first post on this forum. I am writing because I would be very interested to know the opinion of the forum participants on this issue. Almost ten years ago, I wrote a program Cosmic Ray Finder to record particle traces on a webcam (analogue of the project DECO) (the webcam is...
In my intro class, I am trying to design for radiation sources. Currently, I am trying to plot the flux from neutron and photon source locations progressively moving further and further away, however the code is not running and it says "geometry error: no cell found run terminated because 10...
I am nobody important, and don't have any relevant training. I do what I enjoy, and learn whatever my curiosity demands. Lately, that has involved taking a close look at the properties of fundamental particles, trying to see if I can identify any interesting patterns. There are a few! I hope to...
It is said that the universe is made up of approximately 4.9% ordinary matter, 26.8% dark matter and 69.3% dark energy. Why isn't ordinary energy included in this "pie"? I suppose it is included within ordinary matter, but could it be calculated what % are particles with mass and what % is pure...
Let’s consider that the total energy of this system is represented as ##E=-2mB##.
Question 1: how many microstates correspond to this energy level?
We have ##2^4=16## microstates.
++++ Total magnetic moment: ##4m## Energy: ##-4mB##
- - - - Total magnetic moment: ##-4m## Energy: ##4mB##...
I am stuck with this problem.
Intuition tells me the answer is no, but I am struggling to prove it.
If we consider two particles travelling in the same direction, the 2nd particle will gain velocity (impulse is in same direction to velocity), and the first particle will lose velocity (if it...
we can se many particles, also we can detect and produce antimatter
however my question is why even at high energies we can not see any supersymmetric partner of a particle ?
How is quantum entanglement done in practice for different particles with different properties eg. spin, polarization, etc.? Why is entanglement useful for quantum circuits?
*I am curious about how they are actually entangled and used. I don't know how is entanglement applied in practice so I...
Hi,
What happens to the force when the particle are kept at 1 light year distance. I agree practically the force would be very weak because of inverse square law, theoretically what happens to the force?
Inside a dark room, when light comes through a hole, we see the dust particles as the particles scatter the light. But, when the whole window is open, we don't see the dust particles scattering the light. Why?
Particle display in visual editor of mcnp input file only shows particles inside source, I am interested to see particle path towards tally region. Plz guide thanks
Found out the sun loses 4 billion kg per second worth of sunlight in e = mc².
How much mass does the sun lose per second if we include all particles that the sun ejects such as ions and neutrinos? (and, neutrons?)
TL;DR Summary: A completely non-scientific look at wave function, because ChatGPT persuaded me to include my thoughts somehow, some way.
Howdy, the post title, as im sure you've noticed, is a weird one, and out of place in such a location. Fitting, considering the topic, I think.
Backstory...
I have a simulated data of charged particles in a magnetic field. I have selected clusters, each cluster contains a set of points(x,z) and I want to perform RK4 between the first and second clusters and fill the positions in a histogram.
I have selected the clusters with the initial...
Hi, I just got two inquiries:
My understanding is that the saturation current is reached when the intensity of light is fixed, when the potential difference is at its positive maximum magnitude. Subsequently, whatever kinetic energy store of any photoelectrons, however deep within the metal's...
When we make our lagrangian invariant by U(1) symmetry we employ the fact that nature doesn't care how I describe it, but, how come that I can associate the real physical particles with the coordinates I use to describe? Even though gauge symmetry is not a physical Symmetry,
Hi guys,
Can you give me some feedback on whether my calculation is correct? I applied the formula below (Boltzmann Distribution) but I didn‘t know what to use for the variable z. I don‘t even know if I used the correct equation. Can you help me further?
The task is:
Consider a system of...
Is there a correlation between the size of a matter particle (defined as its matter wavelength) and the mass of the particle? With the photon, its wavelength and its energy/mass are inversely correlated. Is it also true of matter particles?
Question:
With maximum do they mean that the speed of the pions is the same as the proton and an antiproton? Otherwise there will be two unknowns, and if I use both relativistic-energy and momentum conservation equations I get difficult equations.
I am by no means an expert in physics, but I have a question. We have recently found the particle that cause attraction (Bos-Higgs) would it not be reasonable to think the there is a particle that cause repulsion? That would lead to cluster of attraction surrounded by fields of expansion. Would...
For an upcoming presentation I am looking for a topic which covers both the field of oscillations/waves and particles in electromagnetic fields.
Do you have any interesting ideas for a possible topic?
Many thanks for your help in advance!
1.How is that possible for us to say that a non-interacting microscopic particle can have numerous values of a physical parameter in a given instant? the mixed state of a microscopic particle is simply the probability distribution of the particle having those values of a given physical parameter...
1) The Hilbert space for each particle and the system are:
##H_1={\ket{\frac{1}{2} \frac{1}{2}}; \ket{\frac{1}{2} -\frac{1}{2}}}##
##H_2={\ket{1 1}; \ket{1 0}; \ket{1 -1}}##
##H=H_1 \otimes H_2##
2) I'm not sure what "considering the total Hamiltonian" means, but I think that the two CSCO...
To get expected value I use
$$E = \int \Psi^* Q \Psi dx$$
where Q = x
$$4a^3 \int xe^{ax} \cdot x \cdot xe^{-ax} dx = 4a^3 \int_0^{\inf} x^3 dx$$
which is undefined.
But the answer is suppose to be 1/a.
I tried solving the problem above by using conservation of energy
##U_{Ei} = U_{Ef} + KE ##
##\frac{4k_eq^2}{\sqrt{2}L} = \frac{4k_eq^2}{2\sqrt{2}L} + 4(\frac{mv^2}{2}) ##
##\frac{2k_eq^2}{\sqrt{2}L} = 2mv^2 ##
## v = \sqrt {\frac {k_eq^2}{\sqrt{2}Lm}} ##
However, the solutions solved the...
Hi,
I am an undergraduate electronics engineer building a GM counter for my final assessment. I read a lot of theory about GM counters as well as the nuclear physics theories in general, but there is one thing I can not find an answer to. Why do none of the GM counters detect alpha particles? I...
According to Chapter 8 of Griffiths' book Introduction to Electrodynamics, the magnetization force that acts on a magnetic dipole is
$$F_M=\nabla (m \cdot B)$$,
where ##m## is the magnetic moment and ##B## is the magnetic field.
For a paramagnetic or diamagnetic particle...
So I understand that fermions are anti-symmetric under exchange, but in the contexts I've seen this explained they were always talking about two particles, or at least two wavefunctions. I'm curious how this works when there are three or more particles. Is any two given pairs of those 3+...
I've been reading about how language around virtual particle fluctuations is metaphorical. This is helpful:
https://www.physicsforums.com/insights/vacuum-fluctuation-myth/
I'm just trying to understand a bit more from a layman's point of view. I found Matt Strassler's article 'Virtual...
So i was able to solve the angular velocity part but i don't know how to find the velocity of centre of mass . For the first part i simply conserved momentum about COM because if i consider the particles as a part of the same system as rod the collision are internal forces . I am mainly...
Two point-like particles of mass m. The particles are rigidly connected to each other with a mass-less rod of length L. The particles are initially at rest in such a way that one particle is at the origin and the other is at the point (0, L). A point-like particle of mass M collides with a...
My article has been published in Quantum Reports.
Expanded abstract:
There is currently no consensus on the interpretation of quantum theory, so this article may be of interest as it contains a review and new results on some relevant mathematical models emulating well-known quantum theories...
https://physics.stackexchange.com/questions/418865/why-does-an-electron-have-spin
I’ve been trying to do research on this and haven’t gotten a clear answer. It sounds like they get it through particle interactions, but I may be misreading it. Is there an answer to this? And if there is, how...
Hello.
I am looking to learn about averaging out a particle gas or any other type of organization of particles within a system or volume that can be approximated onto a grid or mesh where the particles are at a constant distance from each other: https://en.wikipedia.org/wiki/Particle_mesh.
I...
Hello Everybody,
I have a superoleophobic surfaces which shows high contact angle for Water, Oil, Hexadecane...
I am looking for a kind of particles which are attached to the surface and once I touch them with a droplet of oil are dissolving in that oil droplet. If I then remove the droplet...
If we have charged particles having Brownian motion, would this motion be associated with (or produce) heat or electricity? Would it produce electromagnetic radiation (and if it would produce it, what type of radiation in the electromagnetic spectrum)? Could there be Brownian motion of charged...
https://physics.stackexchange.com/questions/273918/is-there-a-possibility-for-discovery-of-anti-graviton-i-e-the-graviton-antipar
How can a graviton have an anti particle even though they are essentially the same thing? Same thing with the photon. Any help would be great
[Mentor Note: The PSE...
In a paper by Bain (2011), particles are left with little ontological value because of the Reeh-Schlieder theorem, the Unruh effect and Haag's theorem. The author claims (and here I am copying his conclusion):
First, the existence of local number operators requires the absolute temporal metric...
In the ongoing quantum interpretations and foundations thread vanahees71 explained to me that the wave particle duality has been explained by the model where the position of a particle is calculated according to a probability distribution traveling in space.
Am I understanding this...
I feel like if something is massless it should be able to travel infinitely fast with any amount of energy. When you have something with mass, you would need an infinite amount of energy to push it infinitely fast, but if the thing you’re pushing is massless, you should be able to push it with a...
I am reading a popular-science book Reality Is Not What It Seems by Carlo Rovelli, one of the founders of loop quantum gravity.
He writes:
and
and
So basically, space (spacetime) is just another quantum field like all the others, and the quanta of this field is the nod. Nods have volume...
Homework Statement:: I came across the following in an online article. I am unable to understand how these elementary particles cause a force to exist.
"Each of the four forces results from the exchange of force-carrier particles.".
Above statement is taken from...
I studied physics in University a bit out of interest. Curious on how exactly one proves the existence of particles.
If I look it up, often the most basic example would be the cathode ray experiment. It seems pretty simple to me, but in my eyes it does not prove the existence of particles...
Why do subatomic particles change what they do when observed? Does it matter who is doing the observing? What happens if a non-sentient robot does the observing? How does that compare with a sentient human doing the observing? Thank you.