Proton Definition and 835 Threads

Hi, i have the following exercise: At the HERA acceleratro of DESY in Hamburg electrons and protons were accelerated to E_e=27.5 GeV and E_p = 920GeV and brought to collision. A)How large is the reaction energy in the centre-of-mass system? B) What is the velocity of the HERA...

1. A) A proton with kinetic energy of 4.95 × 106 eV is fired perpendicular to the face of a large plate that has a uniform charge density of σ = +8.10 μC/m2. What is the magnitude of the force on the proton? B) How much work must the electric field do on the proton to bring it to rest...

I know that energy is equivalent to mass and that a proton is many times more massive than an electron and yet the charges are equal in magnitude in both. How is it the electron is able to match the protons charge with so much less mass? What is it about its configuration that enables it to...

I've read that the mass of a proton has been calculated using QCD. But I assume some measured values are inputs to this calculation? If so can anyone provide a list of all of the values used (speed of light, Plank's constant, mass of other particles?)

Very quick question here that's bugging me. I go to the LHC and send a proton around at 0.999999991c. After 5 seconds of that speed I stop it and take it out. Has the proton become younger or older, by x years, than when it was put in? Thanks!

When you imagine a proton in a certain place during an experiment and expect it to be everywhere else where does the proton appear?

According to fermilab link http://www.fnal.gov/pub/inquiring/questions/antimatter1.html Proton antiproton annihilation at rest releases 1.8 GeV energy, but compare this to annihilation at 2 GeV...

So if the total energy of a particle is E2 = m2c4 + c2p2 what about a charged particle, when you annihilate it you also destroy its electric field, so you get the field energy by collapsing it. how does this factor in?

I wanted to know the average total energies of an isolated hydrogen atom's electron and proton separately. I came across a lot of equations I could try to use, but I figured I'd ask to see if this information has already been approximated. Thanks

where can I get information about the excitation levels (gamma ray spectrum) of a single proton nucleus?

In the position representation, its true that we can use operators to represent the coulombic interaction between the proton and electron of a Hydrogen atom. I've never actually given any thought as to what the elements of such an operator would be (in matrix form of course). I know these...

Hi I'm looking for a good description (high-school to 1st year level) why the ratio of protons to neutrons matters for stability. Single neutrons are unstable, but in a nucleus they are stable and the more nucleons you have the greater the strong force. So why can't you have stable isotopes...

Homework Statement At t=0, a proton is moving with a speed of 5.8\times 10^5 m/s at an angle of 30° from the x-axis, as shown in the figure. A magnetic field of magnitude 1.7 T is pointing in the positive y-direction. What will be the y-coordinate of the proton 15 \mu s later? Homework...

Homework Statement Consider two beams of protons, moving in opposite directions, each with energy 110 GeV. What is the available energy Ea when these beams collide? Homework Equations Ea = \sqrt{2mc^2*E_m} Ea2 = 2mc2(Em + mc2) Ea2 = 2Mc2Em + (Mc2)2 + (mc2)2 p = m/v E = p2/m The...

Homework Statement Find the speed (as a decimal fraction of c) and momentum of a proton that has a kinetic energy of 1000MeV. The proton mass is 1.673x10-27kg, or 938 MeV/c2. Homework Equations KE= (1/2)mv2 KE= \gammamc2 p=mv \gamma=1/(sqrt(1-(v2/c2))) The Attempt at a Solution...

I don't know much about quarks but if a proton is uud and a neutron is udd, is the (mass of a neutron)-(mass of proton)=mass of a down quark?

Can we calculate the difference in mass between a Proton and Neutron? If so, how? [ Moderator: why did you move this from QM to general physics? ]

Homework Statement A single proton and a single electron are fixed at a distance of 2.8 meters from each other. Find the magnitude of the electric force of attraction between them. i have the answer to this, it is: 2.93*10^-29 but now it asks: Find the magnitude of the gravitational...

Homework Statement Draw the skeletal structure of the compound with molecular formulaC3H4Cl4 whose proton NMR spectrum contains a down-field triplet and an up-field triplet with relative integration of 2:2. 2. Rationale for Solution Integration ratio of 2:2 means CH2-CH2, after this one carbon...

(1). Homework Statement Suppose a proton is fired from the negative plate of a capacitor charged up to 1000 Volts. How fast must it be traveling to reach the other side?(2) Relevant equations Okay, so I figured that this would be a conservation of energy problem and used: 1/2mv2 = (KeQq)/r I...

(1). Homework Statement Suppose a proton is fired from the negative plate of a capacitor charged up to 1000 Volts. How fast must it be traveling to reach the other side?(2) Relevant equations Okay, so I figured that this would be a conservation of energy problem and used: 1/2mv2 = (KeQq)/r I...

The charge of an electron is exactly equal in magnitude to that of a proton (2 up quarks plus down quark). What is the theoretical basis for this, or is essentially a fact of nature that is accepted?

Radius of proton due to QED?? In one account of the new findings of smaller proton radius, the claim was repeated several times that the radius of a proton was predicted by QED, in conflict with the new measurement. Why QED? I would think, within a proton, QCD is orders of magnitude more...

How reactive is a proton? Could you have a "gas" or something of protons confined to small pipes without them reacting heavily with the material?

In a particle accelerator I.e. LHC a beam of protons are moving past each other and produce an est 1billion collisions per sec. Here's a question about that and the result of such collisions. please bear with me as this may seem a simple question. how do we know exactly that the results recorded...

Homework Statement A uniform electric field of magnitude 640 N/C exists between two parallel plates that are 4.00 cm apart. A proton is released from the positive plate at the same instand that an electron is released from the negative plate. Determine the distance from the positive plate that...

Homework Statement The electric field at a point in space is E= (200i+ 900j)N/C . What is the magnitude of the proton's acceleration? Homework Equations a = F _{on q} / m = (q/m) E The Attempt at a Solution I determined earlier that the x-component of the electric force on a...

I just started learning about cellular respiration and I'm not clear as to what the word "gradient" means. I see it tied to many terms such as electrochemical gradient, proton gradient and ion gradient. Is a gradient just a space or "field" with varying concentrations of something (protons...

Hey all, i just had a quick question in regards to fusing Boron-11 and a Proton. If one were to fire protons at a block of Boron-11, about what percent of the protons would actually achieve fusion? Would varying the speed of the protons effect the fusion rate at all? (Other than stopping any...

Good Afternoon, I need help on the folloewing question: The Earth's magnetic field is relatively homogenous over large areas. therefore how do we calculate the resonance frequency of a proton? Could someone please direct me to formulas, variables and possible outcomes/solutions to...

Minimum energy a proton must have to penetrate... Homework Statement Determine the minimum energy that a proton must have to penetrate 30 cm of tissue, the approximate thickness of the human body. Homework Equations I used R=[(E/9.29)^1.8]1.11x10^-3 but I'm not sure if this is correct...

I am trying to help my son in his year 12 physics. I know very little of this can someone please assist. find in eV (electron volts) the energy of a proton with a de broglie wavelength of 40 pm (picometres) What would the correct formula be ? A good chance for me to learn as well ;)...

How did he measue the proton velocity in the polonium-beryllium experiment? The only source with some description describes his using current as a means to do so - but sure that would require knowledge of the number of protons in order to ascertain the drift velocity?

Hi, i was wondering what the implication is of the fact that the proton is smaller than was thought to be. there is an article about it http://www.chem.info/News/Feeds/2010/07/topics-plant-operations-the-proton-smaller-than-thought/" thanks

First of all, do you believe the new measurements are accurate and the proton is actually 4% smaller. If you do, What implications do you think this will have?

Homework Statement A proton is fired at a nucleus containing Z protons and N neutrons, with a kinetic energy K. Show that the minimal distance r_0 = [(Ze^2) / 4pi*epsilon_0] * (1/K) Homework Equations E=(q/4pi*epsilon_0) * (r-r' / |r-r'|^3) The Attempt at a Solution I know that at...

Howdy folks, i have read that high energy protons striking a target nucleus (say silicon) can produce neutrons through spallation. Can someone point me to some literature, that gives the following details. 1) What energy neutrons are produced for a given input proton...

Is charge conserved in the remains of the collision?

say we have a slab of glass and an incoming photon , and it hits a proton in the slab of glass , will it get absorbed and re-emitted or will it oscillate the proton , what will happen , Any input will be much appreciated

At a certain distance in vacuum there are proton and electron (they are at rest with resptect to their's CM). I wonder after what time will they collide? Of course, we neglect the fact that when the distance between the particles become very small, there is not only an electrical force acting...

By what factor would the radius parallel to the direction of travel contract for a 7 TeV proton, relative to an antiparallel 7 TeV proton, in the Large Hadron Collider?

Homework Statement If you wanted to accelerate a stationary proton, would you use electric field or magnetic field? why? Homework Equations The Attempt at a Solution

Homework Statement A high speed proton collides with a proton at rest, two proton-antiproton pairs were created. That is some of the accelerated protons kinetic energy was enough to be converted into the mass of the new particles. If the proton-antiproton pairs move along together as a single...

A proton's speed as it passes point A is 53,000 m/s. It follows the trajectory shown in the figure below, in which V1 = 15 V and V3 = 5 V. What is the proton's speed at point B? Figure: http://www.webassign.net/knight/p29-44alt.gif Homework Statement Mass of proton: 1.67e-27 Charge of...

Homework Statement A proton is released from rest at t=o in a uniform electric field whose magnitude is 2.5e-8 N/C. How far has the proton traveled after .5 s? Homework Equations x = vot + 1/2at^2 The Attempt at a Solution x = 1/2(9.81)(.5)^2 = 1.2 but it says the answer is...

1. Predict the minumum speed of a 20.0MeV proton as it passes within 1.0x10^-13 meters of a lead nucleus having 82 protons. (Note: 1eV = 1.6x10^-19 Joules) 2. How do I start off? 3. All i can think of is to get a charge for the lead nucleus by using q=ne which is the number of...

This Prob is from Shankar, 17.2.3 "we assumed that the proton is a point charge e. If the proton is a uniformly dense charge distribution of radius R, the interaction is modified as V(r)= -2(e)^2/(2R) + (er)^2/(2(R)^3) r<R = -e^2/r r>R Calculate 1st Order shift in the ground-state...

Just to start, let me reassure you that I am not an LHC alarmist. I understand and agree with the cosmic ray explanation, i.e. earth, the sun, jupiter, and everything else would be a BH if they didn't evaporate. Anyway, I was reading around a little on wikipedia and came to this page...

How can I get the wavelength of a single proton if its kinetic energy is equal to its internal energy?

my room mate's dating this guy that told me a pretty interesting story recently. him and a few of his buddies got together and made a proton accelerator out of some bitter magnets in a night. he made a "proton generator" out of ionizing hydrogen in a light bulb. one of them is an advanced...