Proton Definition and 835 Threads

Hi guys. I had a question concerning a pure proton plasma with a given temperature and its loss of energy due to the Stefan-Boltzmann law. From my understanding, the Stefan-Boltzmann law applies to objects that contain electrons. I don't think that's true but I would like to know if it is. If...

I've seen explanations that when a neutrino with a W+ Boson comes near a neutron, it affects one of the bottom quarks and changes it to a up quark which effectively turns the neutron into a proton. The neutrino then turns into an electron. Source: (2:20 onwards) I've seen other explanations...

Hi everyone, I'm new at Physics Forum. I'm looking at the different accelerator technologies being used in proton therapy across the world. One of the more recent technologies I have come across is FFAG (fixed field, alternating gradient). It seems to have a lot of advantages over...

A proton is traveling to the right at 3.50×107 m/s. It has a head-on perfectly elastic collision with a carbon atom. The mass of the carbon atom is 12 times the mass of the proton. What is the magnitude of proton speed after the collision? What is the magnitude of carbon atom speed after the...

Homework Statement I understand why, using Gauss's law, the net charge within a conductor should be zero at any point. However, when I try making a Gaussian surface that is so small so as to enclose a single proton, I cannot see why the enclosed charge should be zero for that situation as...

The atomic orbital refers to the physical region where the electron can be calculated to be present, as defined by the particular mathematical form of the orbital (the statement is extracted from atomic orbitals-wiki). The picture of 1s orbital seems to signify that electron can exist in the...

Homework Statement Hi all - I have been trying to evaluate part II of this problem for a long time now... For a simplified model of a proton's charge distribution, Find the constant of proportionality required to normalise ρ correctly. Show that Homework Equations N/A The Attempt at a...

What would happen if I was standing in the LHC and I was hit by a (one) proton traveling at 99.999991% the speed of light. Would the collision burn a hole in me? or would it simply be going so fast that it passes through me without interacting with the particles in my body?

1. The problem statement, all variables and given/kown data Assuming that the nuclear radius R=γ0 *A(1/3) where γ0 =1.2×10(-15) and A is the mass number, Calculate the neutron and Proton densities in a nucleus N=Z. Homework Equations A=N+Z.=2Z in this case. Mass of proton =Z*mp Mass of...

I am new to particle physics, but I heard that electron and positron annihilate each other in case of contact mainly because both have opposite charge( even same mass). Consider an electron is given enough kinetic energy such that it compensates mass differentiation between proton and electron...

I know that the positron and electron have the same mass, which allows them to annihilate, and I know how solve the 2 body Schrodinger for a standard hydrogen atom to get the orbitals. My question is why the math works out the way it does. Is there an "intuitive" (I use that word cautiously)...

Homework Statement A proton is projected in the positive x direction into a region of uniform electric field E = (-5.80 ✕ 10^5) N/C at t = 0. The proton travels 6.50 cm as it comes to rest. Find the initial velocity and the time it takes for the proton to stop. Homework Equations The Attempt...

How was the magnitude of the velocity vector found in the example provided? This is a particle in space so I has 3 coordinates but I am told that the velocity vector is m/s, so wouldn't the magnitude just be 2*10^7 m/s?

Homework Statement In Niels Bohr's 1913 model of the hydrogen atom, an electron circles the proton at a distance of 5.29 E-11 m with a speed of 2.19E6 m/s. Compute the magnitude of the magnetic field this motion produces at the location of the proton.Homework Equations ∫B.ds = μIThe Attempt at...

The proton current in cyclotron are normally measured by Faraday Cup. However, I do not understand that if there is target material for the proton beam. Proton is fully stopped in the target material, for example, water. How the current is measured if it did not hit anything else?

Homework Statement A charged conducting sphere with radius 30cm is having a charge of -50nC. A proton is released from rest at R= 10m. Calculate the velocity of the proton when it reaches the surface of the conductor. What happens to the velocity of the proton when the charge on the sphere...

Anyone know how to do this?? I know that you should usually provide your own working out but I got an exam in one hour and I'm not sure of how to go about this :S Thanks!

p -> e+ + pi° is >10^33 years. what conservation law does this limit test? p is uud pi° is uu or dd where the second quark of each is an antiquark baryon number is not conserved 1 = 0 + 0 charge is conserved lepton number is not conserved 0 = -1 + 0 not sure what this...

Homework Statement Does adding a proton change the atom's orbital angular momentum? Find the probability that the energy is unchanged. Homework Equations The Attempt at a Solution The orbital angular momentum is unchanged, since ##<L^2> = l(l+1)\hbar^2## is independent of Z...

Homework Statement Hello, The question of the problem is: Solenoid, calculate laps of a proton? Someone could help me solve this exercise, but I try not to do this achievement . Would appreciate your help . This is the information that I provided to do the exercise: Picture of the year ...

Homework Statement On the utterly unrealistic assumption that there are no other charged particles in the vicinity, at what distance below a proton would the upward force on an electron equal the electrons weight?Homework Equations I used Newtons universal law of gravitation as well as Coulombs...

All nuclei with A > 210 are alpha emitters, yet very few emit protons spontaneously. Yet both decays lower the Coulomb energy of the nucleus. Why is proton decay not more common?

Consider an atom having multiple protons and neutrons in its nucleus, which of the two nucleons will have higher magnitude of potential energy?

This is related to a homework problem but I want to understand it as well. How can a proton break up into a positron and neutron when a neutron clearly has a greater mass than a proton?

Homework Statement A parallel-plate capacitor has 4.0cm × 4.0cm electrodes with surface charge densities ±1.0×10^−6C/m2. A proton traveling parallel to the electrodes at 2.0×10^6m/s enters the center of the gap between them. Part A By what distance has the proton been deflected sideways when...

I'm in year 10 and I have been studying physics and chemistry. When I learned isotopes, I notice that for isotopes, the number of neutron is always higher than that of proton. Is it possible that there are isotopes that the number of neutron is lower than that of proton? If no, is that because...

Homework Statement A proton is accelerated through a voltage ∆V with parallel plates towards another stationary proton that is "far away" outside of the proton gun. To get fusion, we want them to get close enough to touch at the surfaces. Find the voltage across the plates that would...

I am currently confused... I read that we don't know yet where does the proton spin come from. But I wonder... 1) Doesn't the proton have effectively 3 quarks of spin 1/2 (I said effectively to leave out the quark-gluon sea within the proton)? In that case, 3 spin 1/2 particles can't be added...

A proton and an "positron" (identical to an electron, except positivel Homework Statement A proton and an "positron" (identical to an electron, except positively charged) are brought 6 µm apart and released from rest. a.) What is the initial potential energy stored by this system...

Hi all, a) Do a proton still vibrate if it isn't bound to its nucleus? I mean, if it is "alone" (no neutron, no electron). Do anybody know if they have done experiments on it? I would like to know if it has been observed/measured in some way. b) An electron does not "like" to be still, it...

I'm a microbiologist by training, and only have the basics of physics & math, so please bear with me. Why do cosmologists assert that all the matter in the universe was contained in a volume many times smaller than e.g. a proton (or infinitely small?) prior to the Big Bang? Why...

Homework Statement A proton has an initial speed of 4.9 105 m/s. (a) What potential difference is required to bring the proton to rest? (b) What potential difference is required to reduce the initial speed of the proton by a factor of 4? (c) What potential difference is required to...

Homework Statement An alpha particle (4 times the mass of a proton with a charge of +2e) is at rest 1.0 * 10^-12 m from a stationary proton. The 2 particles immediately move apart. Find the speed of each particle when they are infinitely far from each other. Homework Equations...

I am a young physics student currently attaining my A Levels, therefore my knowledge of this higher quantum physics is very limited. However, I have been given the oppotunity to possibly visit Cern, and conduct an experiment using the Proton beam (proton synchroton) and I must plan said...

Suppose we consider a proton where we set the electric charge of the three quarks towards zero. At this point I assume we still would have the three quarks bound together? Now reduce the strength of the strong force by say ten times. I was told in posts that the radius of the proton depends on...

Dear Forum: I would like to know where could I find charged particle interaction cross section for oxygen-18? I know I can get some of it from ENDF. https://www-nds.iaea.org/exfor/endf.htm Where can I get reference,like the threshold energy for 18O(p,n)18F is 2.5MeV and its cross...

sir i want to know why is number of neutron is more or equal number of proton in nucleus of atoms whose atomic number is more tnan one?

Hello everybody. I am going to propose an experiment with a proton beam at CERN for a contest. http://home.web.cern.ch/students-educators/spotlight/2013/competition-beam-line-schools. Also...

Homework Statement I had to calculate the probability that we find electron more than 0.1 nm away from proton in Hydrogen atoms if ##\psi _{n,l,m}=\psi _{1,0,0}## (i don't know the english word for this state, but I think we all know what we are talking about :D) My result is 0.09957. Now I am...

Homework Statement What is the electric field midway between an electron and a proton separated by 0.8 nm? Homework Equations E=kQ / r^2 . 9E9 x 1.6 E-19 / .(.8E-9)^2 The Attempt at a Solution Any help would be nice!

If we could set the strong force to be ten times weaker (compared with the electromagnetic force) how much would the radius of the proton change if any? In the limit that the strength of the strong force goes to zero does the proton radius approach some limit? Thanks for any help!

Why (or what mathematical reason) is the charge of the electron being -1.60217733 x 10-19 C equal to the charge of the proton but opposite in size? Proton are composed of quarks and electrons don't have anything to do with quarks.

i am reading about MRI. i have seen several in several textbooks that the angle between the direction of the proton magnetic moment μ and the direction of the external magnetic field is 54.7 how did they find that theoretical or experimental if theoretical how can we calculate that

Suppose a universe with only one electron and one proton some distance apart from each others. Suppose that the motion of the particles is governed only by Coulomb's law and strong interaction. What would happen ? The electron and the proton would keep going back and forth through each others...

Hey all, I have a three part question: Homework Statement If A^(3)=(Ax,Ay,Az) is the three-vector potential, J^(3)=(Jx,Jy,Jz) is the three-vector current density, \varphi is the scalar potential and p is the charge density, then the four-current density J is given by: The Attempt at...

Hey all, I have a three part question: Homework Statement If A^(3)=(Ax,Ay,Az) is the three-vector potential, J^(3)=(Jx,Jy,Jz) is the three-vector current density, \varphi is the scalar potential and p is the charge density, then the four-current density J is given by: The Attempt at...

Average Separation of Muon and Proton Homework Statement A muon is a particle with a mass of 206.7 me where me is the electron mass, and with the same charge as an electron. It can be captured in "orbit" by a proton to form a muonic hydrogen atom. a. Find the average separation <r> of...

If you see a statement like "Spin analysis of H(22S) atom can be achieved through the use of Stern Gerlach interferometry" are they talking about the spin of protons or electrons? Are they perhaps always correlated ie. the same? What about H(22P)?

I'm no physicist, so please enlighten me. Is an electron's spin related to the spin of a proton? Do they spin at the same frequency? I read that electrons have a higher magnetic moment and stuff.

Homework Statement I am trying to find the minimum energy for a proton beam to make pions that have 100Gev of momentum. The proton beam is hitting a fixed target. Homework Equations p + n -> n + n + ##π^{+}## The Attempt at a Solution In the centre of mass frame, there is zero...