Particles Definition and 1000 Threads

Almost ALL introductory articles or videos on subatomic particles virtually NEVER tell you what some particles actually DO: what their function or purpose in the grand scheme of things is. The Tau lepton is a good case in point: even the Wikipedia article is absolutely silent regarding what the...

I need websites or books that has quantum mechanical exercises in particular that finds the total angular momentum eigenvalues (for example two spin 1/2 systems). Do you know where I can train?

Homework Statement Two identical particles, each of mass m, move in one dimension in the potential $$V = \frac{1}{2}A(x_1^2+x_2^2)+ \frac{1}{2}B(x_1-x_2)^2$$ where A and B are positive constants and ##x_1## and ##x_2## denote the positions of the particles. a) Show that the Schrodinger equation...

Just a basic question which I will ask through an example: An electron and positron can scatter by annihilating to form either a virtual Z or virtual photon, either of which can then pair produce to give an electron/positron pair (amongst an infinity of other processes whose contributions need...

it is known that einstein's theory has been verified and time slows down for particles that should decay in certain time, takes more time to decay if moving fast. what makes them behave like that, how moving fast makes time to slow down, is it really time or just maybe this has not been...

If we take the Lagrangian of a spin-0 scalar field and use the Euler-Lagrange equation, we end up with the Klein-Gordon equation. Does that mean that the wave equation of spin-0 scalar particles is the Klein-Gordon equation?Thank you

I am using fastjet in pythia8.I am studying jet formation in pp collisions.I need to plot distribution of transverse momentum of fastest particle in fastest jet formed in 1000 events simulated.But i don't know how to access particle properties after jet formation.Like if I want to know the...

Dear Experts, Trying to analyze the work done by internal forces in a very simple two particle system which is attracted to each other with a constant force, i performed calculations based on two frame of references, 1.The center or mass frame of reference and 2. Frame of reference of one of the...

Just about everything I have read about antimatter talks about proton/antiproton, electron/antielectron, and neutron/antineutron annihilation. But what happens if, for example, a proton and an antineutron collide? Would a weird nucleus be created or would there be a partial annihilation...

I'm trying to find a way to understand Q.P. So far I know that each element contains as many protons as it does nuetrons or electrons. Is that right? Derp lol

Homework Statement [/B] Consider two charged particles 1 and 2, each of them able to translate (move from place to place) and to spin.Homework Equations I can not completely think of relevant equations at the moment. The Attempt at a Solution [/B] I am a bit confused on how charged particles...

I request clarification on the the dimensional definition of fundamental particles. 4th dimensional objects interacting with the 3rd dimension would appear as coherent 3D slices of their 4th dimensional bodies at time T. The "slice" observed would be unknown without complete knowledge of the...

I am in college and trying to develop a theorem, If there is any information there is any papers or evidence to dark matter being particles could you please tell me as it will do me a great favor. Thank you for reading

Relativity, Elementary Particles and Black Holes by Thorne & 't Hooft Any idea what this book is and why it is unavailable? Is it a popular science book? I did not know that Thorne and 't Hooft co-authored a book.

Homework Statement A particle has the potential energy shown in the figure. (Figure 1) What is the x-component of the force on the particle at x =5, 15, 25, and 35 cm? I'm stuck on finding the Fx at 25 & 35 cm.Homework Equations F = -du/dx 100 N = 1J/cm The Attempt at a Solution Slope...

Homework Statement I'm trying to understand the information paradox at a black hole. Can three particles be entangled? I read on a site that it's impossible to entangle multiple particles. When searching on google I found out that it is possible for multiple particles to entangle. So what...

As I understand it, a relativistic reversal can occur in a Lorentz boost. A particle's forward angular momentum can become backward angular momentum, if the observer accelerates sufficiently. But the particle and its angular momentum are unchanged. The only change is in the observer’s frame...

Hello I have magnetic sheets A4 sized that could be bent but not enrolled, having a thin thickness. I want to cut them in a circular shapes. The idea, is there any possibility to make one of them (or other material same physics) positively charged and second negatively charged; then have...

I have a very weak understanding of the particle modelling of electrical phenomena.1: Electric field =\frac{Force}{Magnitude of charge} 1 is The definition of electric field on a particle (?) 2: Force = \frac{Q1*Q2*K}{R^2}\\ 2 is Coulombs law, to find force between two particles. 3...

Homework Statement A particle of mass M and 4-moment P decays into two particles of masses m1 and m2 1) Find the total energy of each particle (lab frame). 2) Show that the kinetic energy T1 of the first particle in the same reference frame is given by $$T_1= \Delta M (1 - \frac{m_1}{M} -...

Hello Forum, Could anyone offer some insight on this topic? In the case of a physical system composed of multiple particles, there is only one single wavefunction that depends on the three position variables of each particle and the parameter time t. For example, in the case of 2 particles, we...

Homework Statement A particle of mass m1 collides with a particle of mass m2 initially moving at right angles to it(see Figure 1 below). Calculate the final velocities of each particle, and the angles at which the particles leave the collision site( as measured with respect to the original...

Hey there, I am familiar with the mathematics of multi-particle systems, but have now moved on to trying to plot them. I was a little ambitious and thought I'd attempt to somehow plot energy eigenfunctions of two particles in a 2-D box. Obviously I immediately ran into the issue that there are...

Tony Stark: I've tried every element. Nick Furry: You haven't tried all of them. Are there any other particles besides protons and neutrons (and their antis) that could be stable in the nucleus of an atom?

You often hear "most of everything is made up of empty space", referring to the idea that atoms only have mass in their nucleus. It seems to me that this is trying to explain physics in terms of everyday intuition, rather than the other way around. Specifically we have this intuitive notion of...

Homework Statement Figure (a) shows charged particles 1 and 2 that are fixed in place on an x axis. Particle 1 has a charge with a magnitude of |q1| = 19e. Particle 3 of charge q3 = +16e is initially on the x axis near particle 2.Then particle 3 is gradually moved in the positive direction of...

Homework Statement Homework Equations F=(kq1q2)/d^2 The Attempt at a Solution So it should be fairly easy to use "parts" to come up with each answer Part a Because particle 1 has no pull in the x direction I should be able to ignore it when finding the x component of the force...

Hi, quantum fluctuations enable virtual particles in space. If a rocket travels through space, these particles (real ones of antiparticle-particle pairs) could impact it. Is the effect of an impact dependent of relative speed of such particle and the rocket? For example rocket could be warmed...

Homework Statement I got an alpha particle (charge 2+) fixed at x=0 and an electron fixed at x=2. I then add a fluor ion (charge 1-) to the right of the electron and we note his position xeq. The question is to find the constant spring (k) relative to the harmonic oscillation made by the fluor...

In the beginning there was the Big Bang...then there was plasma...then there were particles, and so on... Now, how is it possible that from a cooling plasma, randomly (?) emerged particles that are so perfectly uniform? I mean, all neutrons are exactly the same...size, mass, properties...and...

Hi. Trying to solve the Gibbs paradox for two identical volumes of ideal gas with ##N## particles each, I found the mixing entropy to be $$\Delta S=2N \log(2)-\log((2N)!)+2\log(N!)\enspace .$$ The usual approach now uses Stirling's approximation to the order ##\log (n!)\approx n\log (n)-n##...

Homework Statement A particle P undergoes the hyperbolic motion x_{P}(t) = \frac{c}{a}(c^2 + a^2 t^2)^\frac{1}{2} along the x-axis of frame S, where c is the speed of light and a is a constant. A second particle, Q, undergoes the motion x_{Q}(t) = \frac{1}{2}ct + \frac{c^2}{a} and so...

Now it is common knowledge that antiparticles destroy particles on collision, and release the same amount of energy as if the masses of the two particles were combined and plugged into E=mc^2. But what about an antiparticle colliding with another antiparticle? Would they have the same effect on...

Assuming two particles are entangled, is there a quantifiable energy associated with separation distance? Rephrasing the question: If two entangled particles are distance x1 apart and another pair of identical entangled particles are distance x2 apart, is there a difference in the energy...

a particle is projected vertically upwards from a point P. at the same instant a second particle is let fall from rest vertically at q. q is directly above p. the 2 particles collide at a point r after t seconds . when the 2 particles collide they are traveling at equal speeds. prove that...

Hello! What are the available technologies to separate small particles from a flow of gas? I assume that if the particles are magnetic we can apply a magnetic field? Any other methods? And what if they're not magnetic? Thanks!

If my understanding is correct, all particles are sources of gravitational fields (albeit minor ones), and the gravitational potential energy between two bodies is given by: U = -GMm/r So, if we have two Z bosons (or any other bosons with mass but no repulsion due to charge) which are traveling...

Homework Statement Homework EquationsThe Attempt at a Solution I am actually stumped by this seemingly simple problem . Since both the particles are moving , in order to calculate angular velocity of Q with respect to P looks to be difficult as the relative velocity of Q w.r.t P is...

im stuck on question 8. the equation i got for the wedge is .6R -.5S=ma r stands for relative force of the particle s stands for relative force of the wedge . i got the equation 4mg-R=5m(.6a) for the particle where a stands for acceleration of the wedge. does anyone know where to go from here...

Do a particle influence another particle by exchange of gauge bosons? If so, how?

The following article says virtual particles don't exist or are just book keeping device. https://www.physicsforums.com/insights/physics-virtual-particles If that's the case, then how do you explain charge screening? We observe the charge of an electron to be less than the bare charge, or what...

I have a little doubt to get cleared. Gravity of the Earth causes an acceleration of 9.8 m/s2 which increases the velocity of a body at free fall. So for a very massive body like a black hole FOR INSTANCE, the acceleration due to gravity on a body will be very high, right? So if a body falls...

Q4 A wedge of mass 11 kg is held on the ground with its base horizontal and smooth faces inclined at 30° and 45° respectively to the horizontal. A 5 kg mass on the face inclined at 30° is connected to a 7 kg mass on the other face by a light inextensible string which passes over a smooth light...

Does Duality serve any other purpose than preventing investigators from fully understanding the framework of our reality?

Homework Statement Ions having equal charges but masses of M and 2M experience a constant electric field while they travel a fixed distance d and then enter a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius R, what is the radius of the arc...

If there are 3 positive charges of +1, +3, +5 coulombs equidistant from a negative charge of 1 coulomb what positive charge will this negative charge be attracted to ? Is the result different if the charges exist in a “bound” state (resulting in electrovalent compounds) where a positive charge...

As much as I have understood, virtual particles keep appearing and disappearing in a vacuum state. This leads to zero-point energy, Casimir effect etc. Now, I want to know if there is a lifetime (i.e. a time limit) for which these virtual particles can exist before disappearing. Also can there...

Can we compute the relativistic velocities of 2 photons or 2 neutrinos ? :))

Hi I am trying to run a fast reactor model but I cannot figure out what is happening because I get the error: run terminated because 10 particles got lost. I am using the sdef card (with and without parameters) and the model is not running. Hope you can help me to fix any mistake I did. The...

Hi everyone. Very orderly forum you have here. I'd like to ask a few philosophical questions which are very fundamental to QM. Firstly I assume we all agree that a fundamental particle - imagine an electron or quark - has multiple inherent properties which are all separable from each other, such...