Particle Definition and 1000 Threads

Homework Statement Homework EquationsThe Attempt at a Solution I know the equation of force on a moving charge in a magnetic field is F=BqV... Why is the answer A ?

Note: added to the title should be "and a particle description". ## \\ ## The intensity (energy density) of an electromagnetic wave is proportional to the second power of the electric field amplitude, i.e. intensity ## I=n \, E^2 ##, apart from proportionality constants. Meanwhile the energy...

In a paper from 2003, it has been shown that the particle horizon is about 14300 Mpc, or 46.6 billion light years (and it has been recalculated in 2016 with more accurate parameters values at around 14200 Mpc = 46.3 billion ly). From what I understand, the calculation proposed in 2003 takes the...

When we look at those pictures of colliding particles in particle colliders, we see a large collection of curves and lines radiating out from the point of collision, representing the new particles which have been created. So two questions about this: 1) Why are these acting like particles in...

Homework Statement Consider the arrangment of charges (fixed in place) shown in the figure. The square has side length d. (Figure 1) Now suppose the particle with charge q is released. It is "kicked" so that it's initial speed is v. After an unspecified trajectory, it is observed that the...

I'm looking for a rigorous mathematical description of the quantum mechanical space state of, for instance, a particle with no internal states. At university we were told that it the Hilbert state of wave functions. They gave us no particular restrictions on these functions, such as continuity...

Homework Statement Homework Equations Equation given in question. The Attempt at a Solution The only thing I could think of was to try changing the y=3x^3 into polar coordinates but I didn't know where to go from there... Could I get some direction to how I should go about this, I'm sort of...

Hello guys, I programmed a physics simulation where a particle with some initial conditions bounces off the walls of a 2d container. The simulation also includes gravity in the y-coordinates. The aim of the project is to produce a visual animation and further on include more particles and...

I was wondering what kind of properties the new particle detected from the LHC would have? For example is the particle charged? Could an electron orbit it and is it a stable enough particle to be able to participate in chemical interactions? What else is known?

Homework Statement Hi! I'm having issues with this practice problem. Any advice on what I'm doing wrong would help! A 2.5 kg particle is projected with an initial speed of 3.3m/s along a surface for which the coefficient of friction is 0.7. Find the distance it travels given that the particle...

In the 'Particle in a box' system, with the well being extremely narrow, why does the particle path have to follow certain energy levels compared to the classical system? Thanks in advance.

What is smallest particle in an electron or a quark?

Could a particle move through and displace a Bose-Einstein condensate, causing it to wave?

First, I am new to physics and only taking my first course in calculus based classical mechanics with topics covering thermodynamics and an introduction to general and special relativity. Everything here is pretty much a question, even if periods exist and not question marks. My teacher had...

I want to solve stokes eq. for particle diameter in um size. Do i have to change the units to make them uniform. please help in solving the eq. by plugging these numbers. velocity= 50 mm/h Particle density= 2650 kg/m^3 Medium density= 1000 kg/m^3 viscosity = 1.002 mPa Gravity= 9.8 m/s^2

I'm not sure if this is the right place for this question., but I'll ask anyways. So in particle accelerators when the protons "crash" particles are created because of the extremely high amount of energy(example of e=mc^2?)? Is that correct? Also, where do these particles come from? The Higgs...

What is the smallest particle which can be visually observed with a microscope?

Can one particle be entangled with multiple particles at the same time? Let's say we have particle A, and particle B, then particle C. Can particle A be entangled with particle C and B at the same time? Sorry if this is a stupid question.

Homework Statement A particle of mass 0.195 g carries a charge of -2.50 x 10-8C. The particle is given an initial horizontal velocity that is due north and has magnitude 4.00 x 104 m/s. What are the magnitude and direction of the minimum magnetic field that will keep the particle moving in the...

Hello! I read several times that those at CERN observe a new particle with a precision of 3-3.5 sigma and overnight (more or less) hundreds of papers in theoretical physics appear explaining the role of that particle and all its physics implication and after a while CERN announces that there was...

When two deuterons fuse, I understand they form an alpha particle in an excited state. Based on mass differences the fusion releases 23.85MeV, which is enough to eject a proton (19.81MeV) or a neutron (20.58MeV) from the alpha particle. It seems to prefer neutron emission, as this fusion is used...

Homework Statement When a particle moves along the helix shown, the componentsof its position vector are x=Rcosωt , y = Rsinωt , ##z=-\frac h {2π} ωt## where ω is constant. Show that the velocity and acceleration have constant magnitutes, and compute their values if R=1.2m, h=0.75m, and...

Consider the particle in a box problem. The number of energy eigenbasis is 'countable' infinity. But the number of position eigenbasis is 'uncountable' infinity. x can take any value from the interval [0,L] Whichever basis I choose, shouldn't the dimensionality of the vector space be the same?

Question: When alpha particles, having kinetic energy 3.0000 MeV bombard nitrogen-14 nuclei, oxygen-17 forms and the reaction releases a proton. Calculate the kinetic energy shared by the reaction products. Nitrogen-14 = 14.000307 amu Helium-4 = 4.00260 amu Oxygen-17 = 16.99913 amu Proton =...

So, I found this document that talks about rf cavities at lhc https://home.cern/about/engineering/radiofrequency-cavities Can you please explain me what i underlined Means? If i understood when the particles achieve the velocity the scientist want them to achieve they get into the cavity when...

I think the answer is incomplete, because proving that ##\psi(x)## isn't stationary doesn't prove that the particle isn't localised, it doesn't prove that ##\psi(x)\neq0## at ##0<x<\frac{a}{2}## at some later time. ##\psi(x)## could always be changing on the left side of the box (say from a...

https://www.nature.com/search?journal=nphys&q=wave%20particle%20duality&page=1 When people come to this forum enquiring about the concept of wave particle duality the usual advice seems to be based on the idea that the concept is outdated and has historical interest only. The problem is that...

Consider a particle in the ground state of a infinite well with sides at ##x=0## and ##x=a##. The ground-state energy ##E_1=\frac{\hbar^2\pi^2}{2ma^2}##. The energy of the particle is entirely kinetic. Hence, ##E_1=\frac{p^2}{2m}##. Solving for ##p##, we get ##p=\pm\frac{\hbar\pi}{a}##. So the...

The action for a relativistic point particle is proportional to the infinitesimal invariant length ds. Is there some more intuitive explanation for this? The action is defined by taking the time intergal over the difference between the kinetic energy and the potential energy. So how does this...

Homework Statement In a particle physics lab, an electron e− and a positron e+ collide, annihilate, and produce a W+ boson and a W− boson. Just before the collision, the electron and positron have a total energy of E = 100 GeV each, with velocities pointing along the +x-axis and -x-axis...

Please, can you give me a site where the physics of particle accelerators is explaimed with numbers and equations to high school Level? I found the site of the department of Energy and the cern but there are not equations like the lorentz force and the oscillating fields... I need something a...

Homework Statement Plot the electric potential ##V(r)## due to a positively charged particle located at the origin of an XY plane. Homework Equations ##V=\frac 1 {4πε_0} \frac q r## The Attempt at a Solution I'm unfamiliar with 3D coordinates at this time, but I like to know how can I plot it...

If I have a particle with: Momentum: p Spin: s Energy: E Position: x Time coordinate: t Charge: q And I preform a CPT transformation on said particle, what will these variables become? Can you show me mathematically? Also, could you show me how this effects the wavefunction/quantum state of...

If the units of angular momentum are quantised in integer amounts of ##\hbar##, does that then imply that we have restrictions on the smallest possible radius ##r## of an orbit of a given mass ##m##, given that the speed of light is ##c##. As follows, $$\hbar=m\bf{r}\times \bf{v}$$, where v is...

I am not a student; this is for work. Would some kind soul: a) direct me to an online calculator to enable answering the following or b) give me the answer and show how you arrived at it :) or c) advise me of the formula / process by which I can arrive at the answer? THANK YOU! What is the...

I can't seem to solve it, considering inertia can someone please solve it, both of the following question in the given picture. I would be very much thankful.

Hello, we were introduced to qunatum physics this semester. We were tackling the problem of particles sent with a certain value of energy into a potential well as well as a barrier. The not so very new thing to me was that the probability is non zero in places where the potential is higher. In...

When a particle and antiparticle pair is created are they created on the same position? If they weren't in the same position it would lead a problem on energy conservation, but they are fermions so they shouldn't be on the same position in space.

Homework Statement The Q-value of alpha decay of Pu-239 is 5.244 MeV. Calculate the energy of the alpha particle in MeV. Calculate the energy of the recoil nucleus decay product in MeV. (answer correct to 3 decimal places) Homework Equations The Q value of a nuclear reaction is the difference...

When a particle and its corresponding anti-particle interact do they always annihilate or are there other possible interactions that can occur, such as them scattering off of one another? If the former is true, why do they always annihilate? If the latter is true, is it the case that the most...

I made the problem up myself, so there might very well not be a rational answer that I like! Homework Statement A point-particle is released at height h0 is released into a parabola. The position of the particle is given by (x, y) and the acceleration due to gravity is g. All forms of friction...

Homework Statement Particles of mass ##m## and charge ##q## are initially traveling in a beam along the ##z## direction with speed ##v## when they enter a long magnetic quadrupole lens, where there is no E-field and the magnetic flux density is ##B = Ay\hat{i} + Ax\hat{j}##, and where A is a...

Homework Statement In the given figure, a wedge of mass 2m is lying at rest on a horizontal surface. The wedge has a cavity which is the portion of a sphere of radius R. A small sphere of mass m is released from the top edge of the cavity to slide down. All surfaces are smooth.Prove the maximum...

Homework Statement Consider the process of decay of a muon into one electron, one electron antineutrino and one muon neutrino using the Fermi theory. Assume the matrix element is, ignoring the electron's and the two neturino's masses, |\mathcal{M}|^2 = 32G_F^2(m^2-2mE)mE being E the electron...

Take a spin-1/2 particle of mass ##m## and charge ##e## and place it in a magnetic field in the ##z## direction so that ##\mathbf B=B\mathbf e_z##. The corresponding Hamiltonian is $$\hat H=\frac{eB}{mc}\hat S_z.$$ This must have units of joules overall, and since the eigenvalues of ##\hat S_z##...

I'm interested to become an experimental physicist particularly in particle physics. I have the chance to pursue a double degree. what is the best choice that will help me more in my future career.- a double degree in physics and computer science or a double degree in physics and material...

Question 1: Current particle accelerators are only able to speed up particles up to around 0.16c. However, in nuclear reactors, radioactive nuclei release subatomic particles, i.e. electrons, at more than 0.75c. To increase efficiency and perhaps to observe how particles collide at high speeds...

If a smooth sphere with radius a is fixed on a plane, and a particle is projected horizontally at the highest point outside/on of the sphere with speed (4ag/5)^0.5, I know that the particle will lose contact with the sphere when it makes an angle of theta with the upward vertical, where theta is...

I intuitively understand macroscopic vibration, but trying to understand what it means for a particle to vibrate doesn't seem to make sense from the classical understanding I have of momentum and energy. First, are particles even said to vibrate or have vibrational energy? If so, how is momentum...

Homework Statement The wave function of a particle of mass m confined in an infinite one-dimensional square well of width L = 0.23 nm, is: ψ(x) = (2/L)1/2 sin(3πx/L) for 0 < x < L ψ(x) = 0 everywhere else. The energy of the particle in this state is E = 63.974 eV. 1) What is the rest energy...