Proton Definition and 813 Threads

why is each fundamental particle round

I read some time ago there are many more as 3 quarks in proton but lot of publications mention only 3 quarks! Where is the truth?

Homework Statement Two protons are 2.5fm apart. What is the magnitude of the electric force on one proton due to the other proton? Homework Equations Fe = K|q1||q2| / r2 The Attempt at a Solution Fe = (9 x 109)x(1.6 x 10-19)2 / (2.5 x 10-15)2 Fe = 37 N I got the answer but I don't...

Hi all, I'm attempting to write something on proton decay (specifically in the p \rightarrow K^{+} \nu channel) and need to understand some theory that predicts it. I'm under the impression that the MSSM is the most straightforward theory. However, I look through introductory texts/documents...

Probably a basic question in this field but I haven't been able to find the answer upon internet search. Suppose I send a beam consisting of protons and positrons with a given momentum into a cloud chamber, how can then I tell them apart? My own rough guess: Suppose the two particles undergo...

This the answer that I have from Chalnoth in my other thread about nuclear fusion inside the sun (or star in main sequence). And after iron burning in the core of massive star, the star explodes and leaves a neutron star (or a black hole) behind. Is producing neutron in P+P reaction chains and...

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I am having trouble deciding when to use which equation. If you're given the wavelength of a proton, let's say 100 fm, and have to find the kinetic energy of it, how would you do this? Here are my ideas: Idea 1: Use lambda = h/p, where p = sqrt(2Em). Idea 2: Use E=(pc)^2+(mc^2)^2 =...

After calculating the force upon an electron and a force upon a proton in the atom of hydrogen, my result was a force of ≈8.2x10-8 Newtons acting upon the electron and proton each. If found this by using the formula Fe = (ke q1q2)/r2 Taking this number, I then applied it in the formula F = ma...

According to Feynman's lecture in physics an electron doesn't fall on the proton because of the uncertainty principle. Now, if electron falls on the proton, it's position and momentum can be known so it leaves some place for it to move. But uncertainty principle is applicable for all particles...

Dear PF Forum, I have a question to ask. Supernovae produce neutron star (or Black Hole). This is what I summarize from wikipedia. 1. Is P + e = N? Is it that simple? Judging by its mass, altough slightly off. 2. Is Up Quark + e = Down Quark? Thanks for any answer

Homework Statement Consider; p+p \rightarrow d + e^+ + \nu_e Assume the binding energy of deuteron is 2.2MeV, calculate the maximum energy that the positron can have. Homework Equations m_p=938.28MeV/c^2 m_n=939.566MeV/c^2 m_d=1875.6MeV/c^2 The Attempt at a Solution Assuming the neutrino was...

When a proton is annhilated, is there gamma radiation emitted?

I'm a little out of touch with this stuff , but I'm really not getting it.. So my book is considering: in a nucleus of ##z## protons, consider one proton in spherical charge distribution to other protons. So ## \rho = (z-1)e/(4/3) \pi R^{3}##, where ##R## is the radius of the nucleus, is the...

As far as I understand, ##I_{3}##, the component of isospin in a certain direction is additive, but ##I## is to be treated as a vector sum, is this correct? So, ##I_{3}=1/2## for ##u## quark, ##I_{3}=-1/2 ## for ##d## quark. Adding ##I_{3}## then for a proton we find ##I_{3}=1/2## and for a...

A proton initially moves left to right along the x-axis at a speed of 2 x 10^3 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.15m before coming to rest. What acceleration magnitude does the proton experience? equations E = kq/r^2...

I just want to know what is the effect of proton spin & coloumbs repulsive force & nuclear interaction on binding energy. Please explain with derivation.

Supposed to represent a relativistic proton colliding with a stationary proton, leading to changes in the momentum of both and the production of a neutral pion. The pion then decays into two photons. No clue if this is right. I've never drawn anything much more complicated than...

Homework Statement Calculate the normalization parameter A in the wavefunction ## \varPsi(x,t) = A e^{i(k\chi - \omega t)} ## for a beam of free protons traveling in the +x direction with kinetic energy 5 keV and a density of ##7.5 * 10^9 ## particles per meter beam length. Homework...

Hello ! I would like to know if the following relation, which numerically holds true according to the data available on wikipedia, can be analytically deduced from the current standard physics and model of a proton: R = 4 x L x ( M / m ) =4 x 1.61619997e−35 x 2.1765113e−8 / 1.67262177774e−27 =...

Quite a simple query really, The question wants me to draw a Feynman diagram for a number of particle interactions, some are not possible, some are. This interaction: proton + antiproton ----> 3 gamma This would require each quark (uud) to annihilate with its anti matter counter part. This...

Lately I've started learning about fuel cells, particularly proton exchange membrane fuel cells (PEMFC), and a fairly basic question that has been bugging me is: Since the cathode is positive, it is clear why the electrons flow through the load and to the cathode, but why do the...

1. Consider free protons following a circular path in a uniform magnetic field with a radius of 1meter . At t=0 , the magnitude of the uniform magnetic field begins to increase at 0.001Tesla/second . Enter the tangential acceleration of the protons in meters/second2 : positive if they speed...

Homework Statement A proton of mass "m" is accelerated up to a kinetic energy "K" and then collides with a stationary proton at rest. All that is left after the collision is a new particle of mass "M". (a) Write out the momentum and energy equations for the collision. (b) What is the maximum...

What subatomic particle is emitted when a diatomic Hydrogen molecule transitions from Orthohydrogen to Parahydrogen? e.g. during cooling And why can you cool a sample of Hydrogen to assure that all H2 molecules are para-, but you cannot heat to have any more than 3:1 ortho-:para- ?

When we say 938 MeV/c^2, is the speed of light already factored in? because I have read in some places where if you multiply this by c^2 you get the energy, and that is 938 MeV rather than 938* (2.998e8)^2 so when considering the rest mass of the proton, is the c^2 a variable, or a unit?

Hey guys, I understand it would be logical for electron and proton to have the same charge but with opposite signs... Why then is there a smalll difference between their charges? Thank you

1. Can a proton be created in a particle accelerator that doesn't use protons? For instance, an "electron-positron" collider? I understand baryon number needs to be conserved, so this would necessitate the accompanying creation of an anti-proton, but I'm wondering if these colliders have...

I have seen in many places, for example here, the statement that the proton consists of valence quarks and sea quarks. I am somewhat confused as to where this picture comes from. The sea quarks are virtual quark-antiquark pairs. I have encountered virtual particles only in the context of...

Homework Statement A proton of mass m is moving with initial speed v0 directly toward the center of a nucleus of mass 31m, which is initially at rest. Because both carry positive electrical charge, they repel each other. Find the speed v' of the nucleus for the following conditions: a) the...

This is 2 questions in 1 go. So my first question is how much does a Proton weigh? My second question is, what is the mass of the Proton in a particle accelerator going nearly the speed of light. I know that as you speed something up its mass increases. Also could you show me how you came to...

How would one calculate the de Broglie wavelength of the proton in the hydrogen atom as the electron and proton pirouette around their common center of mass, for the lowest orbital? I believe the center-of-mass of the system would actually be inside the proton due to the great differential in...

Hey, I've been trying to figure out why a protons in identical environments will not undergo spin-spin splitting with one another. From what I understand splitting of a signal for a proton is due to the nucleus of another nearby either opposing the external magnetic field or acting in the same...

Homework Statement A 10 gram silver sphere is charged until it acquired a charge of -1.2 coulomb. Find ratio of number of electron to number of proton in spere. Given that silver atomic weight and atomic number 107.87 and 47 Homework EquationsThe Attempt at a Solution first i calculated extra...

Homework Statement An electron is rotating around a proton (at rest) in a perfect circular orbit. If the radius of the orbit is r=10^-10 m, how long is the rotation period [hint: the radial acceleration is entirely due to the electric force] k=9*10^9 q=1.6*10^-19 Homework Equations 1...

how is a mass of a proton moving at a high speed calculated experimentally?

I know this question sounds... find a word for it you like... But please bear with me. A proton. An electron. Not very high speeds...Vacuum.. A proton has an electric field, so does an electron... They arrive into each others' fields and start to accelerate towards each other... What...

Where does the proton come from in a Cyclotron?

Homework Statement What thickness of copper is required to stop a 500 MeV/c proton? Homework Equations E=(m^2+p^2)^1/2 The Attempt at a Solution So I have been to some websites and trying to google this- and everyone is using charts and looking of the value of the range in a material...

The reaction p→n+e++νe is common inside nucleus. But it not considered when we talk about free particle and reason is simply given mass of products being larger than reactants. Now my question is if there is a high energy proton having total energy in order of 2 GeV or let it to be 100 GeV (To...

So I was watching TV and I got to thinking. If a hydrogen atom has 1 proton and 1 electron... What element would you make if, instead of adding protons and nutron to the nucleus, you were to somehow add additional electrons to the orbitals of that single proton? Is it even possible and what...

Homework Statement Between two plates (distant 4cm) there's an electric field (E = 100N/C). A proton starts moving from the positive plate and an electron starts moving from the negative plate. At what distance from the positive plate do they meet? (is "meet the right verb here? :biggrin:)...

I have the proton wavefunctions of mixed symmetry: |MA> = \frac{1}{\sqrt{2}} ( u_1 d_2 u_3 - d_1 u_2 u_3 ) and |MS> = \frac{1}{\sqrt{6}} (2u_1 u_2 d_3 - u_1 d_2 u_3 - d_1u_2u_3 ) If the charge defined as: qu =\frac{2}{3} u and qd= -\frac{1}{3} d , I need to show what are the...

When a moving proton travels through a magnetic field, doe's it's magnetic field (that it's giving off) naturally align with the outside magnetic field (due to a magnet or something in the environment)?

[Note by mentor: This thread does not use the homework template because it was moved here from a non-homework forum.] Hello, I have a problem with this exercise. I don't know if my solution is right! Could you check it, please? A proton with kinetic energy Kp is moving in a uniform magnetic...

What are the magnitude and direction of the electric field that will balance the weight of (a) an electron and (b) a proton? Please I am getting confused in this question. I want help with complete explanation. Thanks in advance. How will it done..?

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...