Proton Definition and 845 Threads

  1. scupydog

    Heavy Hydrogen: Proton, Muon/Tauon - Stability?

    A hydrogen atom is consists of a proton (uud quarks) and an electron. Is there a heavier atom of hydrogen that consists of a type of proton (ccs or ttb quarks) and a muon or tauon respectively? Are these
  2. C

    Voltage Needed for a Proton to Arrive at Sphere at A Certain Speed

    A metal target sphere of 30 cm diameter suspended out in space is given a charge of +1.00 nC. Through what voltage must a distant proton be accelerated from rest (by some sort of space weapon) if it is to arrive at the sphere at a speed of 8.2*10^4 m/s? (Neglect any gravitational effects.) V=...
  3. S

    Do electron attract proton, or proton attract electron?

    I know they are strongly attract each other, but which one will attract first? is it depend on the mass of proton and electron? if yes, then it would be electron attract to the proton, am I right?
  4. K

    Point charge, proton placement, x-, y-axis

    Homework Statement A point charge q = -0.368 nC is fixed at the origin. Where must a proton be placed in order for the electric force acting on it to be exactly opposite to its weight? Let the y-axis be vertical (positive up and negative down) and the x-axis be horizontal (positive to the...
  5. M

    Where should the proton be placed to balance F?

    Homework Statement A point charge q = -0.5nC is fixed at the origin. Where must a proton be placed in order for the electrical force acting on it to be exactly opposite its weight? Homework Equations F= k(q1)(q2) ------------ r^2 The Attempt at a Solution Trying to...
  6. P

    How can I find the velocity of a proton?

    Homework Statement A charged particle (either an electron or a proton) is moving rightward between two parallel charged plates separated by distance d = 2.20 mm. The charge on the left has a potential of -70V and the charge on the right has a potential of -50V. The particle is slowing from...
  7. T

    Uniform electric field and a proton

    Homework Statement A proton moves at 4.50x10^5 m/s in the horizontal direction. It enters a uniform vertical electric field with a magnitude of 9.60x10^3 N/C. Ignoring any gravitational effects, find a) the time interval required for the proton to travel 5.00 cm horizontally b) its vertical...
  8. Z

    An electron with known speed and distance from a proton moving away?

    Homework Statement Suppose that an electron is set down 10e-10 m away from a proton that is "pinned down" so that the proton cannot move. The electron has a velocity V0= 1.6e6 m/s pointing away from the proton, along the line between the proton and the electron. What is the force on this...
  9. M

    Proton is shot away from inf. charged plane

    Homework Statement The surface charge density on an infinite charged plane is -2.6*10^-6 C/m^2. A proton is shot straight away from the plane at 2.2*10^6 m/s. How far does the proton travel before reaching its turning point? Homework Equations Im very unsure of what equations to use, the...
  10. E

    How Do You Calculate Proton Velocity and Acceleration in an Electric Field?

    Homework Statement Homework Equations Ki + Ui = Kf + Uf The Attempt at a Solution I need to find the velocity of the proton when it's 2.3mm's to the right of where it is now. I need to find the acceleration of the proton. I believe that I should use F=ma to do this. The only...
  11. S

    What is the Source of the Positive Charge of a Proton?

    Electrons have no known substructure, right? ...And they have a negative charge. Protons have known substructures...and protons have a positive charge. From whence does the positive charge of a proton arise, if not from the charges of a proton's substructures per se (in the way an ion has...
  12. P

    What Structural Configuration Explains 10 Identical Hydrogens in C8H18O?

    I am attempting to identify an organic "mystery compound." Having run both IR and mass spectrometry, I conjecture that the compound has a molecular mass of ~130 amu and possesses at least one -OH group. C8H18O fits this profile nicely, but no isomers of which I can conceive are commensurate...
  13. C

    How much energy a photon has to have the momentum of a 10MeV proton

    How much energy must a photon have if it is to have the same momentum of a 10-MeV proton? I am not sure how to go about starting this one. Can someone help me out?
  14. F

    Calculating Electric Potential of a Proton in Hydrogen Atom

    Homework Statement Find the electric potential a distance of .5 x 10^-10 m from the proton of a hydrogen atom Homework Equations V= kQ/r The Attempt at a Solution I know how to answer the question, because I know which equation to use. What I do not understand is, where the...
  15. C

    Interesting paper - The Schwarzschild Proton

    I would have thought this standard crackpottery, but evidently it won "Best New Paper" from the University of Liege in Belgium! What do you all think? http://www.theresonanceproject.org/pdf/schwarzschild_proton_a4.pdf I can't find anything about the "quantum vacuum density" he talks...
  16. N

    Current / Magnetism Questions: Proton near magnetic field of moving electrons

    Homework Statement Ok guys, this problem has a few steps to it, and id appreciate any help I can get. Ok, so beam of electrons moving left, positive particles with same but opposite charge moving right, both moving at 1x10^8 m/s. Then there is a proton moving left on top of the beam nearby...
  17. M

    How Many Revolutions Does a Proton Make in a Cyclotron?

    Homework Statement A 66.0-cm-diameter cyclotron uses a 530 V oscillating potential difference between the dees. How many revolutions does the proton make before leaving the cyclotron? Homework Equations f = (q*B)/(2*pi*m) The Attempt at a Solution I find the cyclotron frequency: f =...
  18. K

    Need help on how to find distance between electron and proton

    [b]1. According to the "Solar model" of a single ionized Helium atom has one electron revolving in a circular orbit around a stationary nucleus made of two protons and two newtrons. The diameter of this atom is .95*10^-10m. Use Coulomb's law and calculate the speed of the electron (m/s) in its...
  19. T

    Existence of the proton necessitate the existence of the electron?

    Does the existence of the proton neccessitate the existence of the electron? I think it is strange that the number of electrons is exactly equal to the number of protons at every event level of the universe.
  20. M

    Proton speed needed to circle the earth

    Homework Statement Assume that Earth’s magnetic field is every- where perpendicular to the path of a proton and that Earth’s magnetic field has an inten- sity of 4.19 × 10−8 T. What speed would a proton need to achieve in order to circle Earth 1550.0 km above the magnetic equator...
  21. M

    What speed would a proton need to orbit in an exact circle ?

    Homework Statement Assume the Earth’s magnetic dipole moment is aligned with the Earth’s rotational axis, and the Earth’s magnetic field is cylindrically symmetric (like an ideal bar magnetic). What speed would a proton need to orbit in an exact circle around the Earth at a height of 476...
  22. S

    Average force opposing a proton

    Homework Statement A proton with mass 1.67 X 10-27 kg that has a speed of 5.0 x10[6] m/s passes through a metal film of thickness .010 mm and emerges with a speed of 2.0 x 10[6]m/s. How large an average force opposed its motion through the film? Homework Equations I'm thinking Newtons...
  23. F

    Finding Revolutions per Second of Electron & Proton in Magnetic Field

    Homework Statement An electron of speed v enters a region of magnetic field B directed normally to its velocity and is deflected into a circular path. Find an expression for the number of revolutions per second the electron will make. If the electron is replaced by a proton, how does your...
  24. S

    Relativity proton beam relative velocity problem

    hi guys I am new to this forum so this is my first post would appriciete some help with this problem Homework Statement in a colliding beam experiment, in a laboratory frame equal and opposite velocity proton beams collide. the relative velocity of the beams is 2.99 x 10^8 m/s, calculate...
  25. A

    How Does Ion Conduction Work in PEMFC and Proton Conductors?

    I'm having some trouble grasping what it means for something to conduct ions. A material is ion-conducting, transporting hydrogen ions (protons, essentially), but electronically insultating? For something to conduct current, it is ultimately nothing more than a flow of charge and, I recall...
  26. L

    Explanation of the mass and charge of the proton

    How can quantum mechanics propose an explanation of the mass and charge of the proton using particles with partial charges and guessed at mass but ignore the mass and charge of the electron?
  27. S

    Magentism: Solving Proton Homework Statement

    Homework Statement A proton of mass m, and charge q is in a box that contains an electric field E, and the box is located in Earth's magnetic field BEarth. The proton moves with an initial velocity v vertically upward from the surface of Earth. Assume gravity is negligible. a. Indicate...
  28. H

    Find the mean lifetime of the proton

    Homework Statement Three proton decays per cubic kilometer of water per year are detected by an array of photomultipliers immersed in the sea. Find the mean lifetime of the proton. Homework Equations t = 1 / lambda The Attempt at a Solution How is it possible to work this out...
  29. D

    Proton moving through a magnetic field

    Homework Statement A proton moves perpendicularly to a magnetic field that has a magnitude of 6.48x10-2T. A magnetic force of 7.16x10-14N is acting on it. If the proton moves a total distance of 0.500m in the magnetic field, how long does it take for the proton to move across the magnetic...
  30. L

    Calculate Velocity of Protons in CM Frame After Elastic Collision

    proton mass 938MeV/c^2. Consider an elastic collision between two protons. IN the centre of mass frame the kinetic energy of each proton is equal to its rest energy. calculate the speed of the protons in the CM frame. clearly they will be equal and opposite velocities so the two speeds...
  31. M

    Proton moving through magnetic field

    Homework Statement A proton moves through a uniform magnetic field given by =(6.97-9.54+35.0) mT. At time t1, the proton has a velocity given by =vx+vy+(1.58 km/s) and the magnetic force on the proton is FB=(4.72 X 10-17N)+(3.45 X 10-17N). (a) At that instant, what is vx? (b) At that...
  32. 3

    Ratio kinetic energy of alpha particle / kinetic energy of proton

    Homework Statement A photon and alpha particle are accelerated from rest through the same potential difference. After acceleration what is the ratio kinetic energy of alpha particle / kinetic energy of proton? Homework Equations I guess I have to use eV = 1/2mv^2 The Attempt at a...
  33. C

    Force and acceleration of a traveling proton in a magentic field

    What force and acceleration would a proton experience if it has a velocity of 2. 106 m/s perpendicular to a magnetic field of 2.0 T? force: ________ N acceleration: _______ m/s2 Homework Equations F = ma Frictional force = uk(n) Acceleration=force divided by mass.
  34. D

    Is a Hydrogen Nucleus the Same as a Proton?

    I thought that the hydrogen nucleus is just a single proton. So why does this page mention "electorns, protons, hydrogen nuclii", etc? http://blogs.discovermagazine.com/badastronomy/2009/04/07/hot-light-from-a-cold-comet/
  35. L

    Estimating t Dependency on Proton Separation d

    Homework Statement Knowing that the wave function of the hydrogen atom is proportional to e-r/a0, estimate how t depends on the proton proton separation d. I need just to make a drawing of the integrand and make a reasonal approximation using my intuition (no numerical methods allowed to...
  36. I

    What happens when electrons crash into their proton

    Do they just destroy each other?
  37. D

    Potential Energy of Electron & Proton in an Electric Field

    when an electron moves closer to the electric field source, does the potential energy get higher or lower? if it is being accelerated from the infinity, then at the infinity it should have the lowest kinetic energy? then when it is closer to the source of the field, it should have the...
  38. S

    Proton moving in magnetic field

    Homework Statement At a particular instant a proton is traveling in the +z direction, with speed 4105 m/s. At the location of the proton there is a magnetic field of magnitude 0.25 T in the +x direction, due to current running in a nearby coil. what is the direction and magnitude of force on...
  39. T

    If a proton rebounds at 90 degrees Momentum and elastic collision problem.

    Homework Statement a) State the law of conservation of linear momentum. b) A proton of mass 1.6*10-27kg traveling with a velocity of 3*107ms-1 collides with a nucleus of an oxygen atom of mass 2.56*10-26kg (which may be assumed to be at rest initially) and rebounds in a direction at 90 degrees...
  40. M

    Protons delivered per second in a proton beam

    Homework Statement a 5.0 mm-diameter proton beam carries a total current of 1.5mA. the current density in the proton beam, which increases with distance from the center, is given by j=j(edge)(r/R), where R is the radius of the beam and j(edge) is the current density at the edge. a) how many...
  41. S

    Position of a proton in Quantum mechanics.

    Homework Statement Find the maximum accuracy that can be found to a proton's position without changing it's (not-realativistic) kinetic energy by more that 1 keV I think this involves Heisenberg's uncertainty principle \Delta x\Delta p=hbar/2 but I am not sure at all. Now to find the...
  42. A

    Scattering an electron off a proton.

    Protons and neutrons have a diameter of around 10^{-15}m. Despite this small size, physicists were able first to probe inside these particles in the 1970s, by scattering high energy electrons off them. i). explain briefly why it is important that the electrons have high energy. Since...
  43. P

    Velocity of a Proton in a Capacitor

    SOLVED Homework Statement A proton is fired horizontally with a speed of 1.1 106 m/s through the parallel-plate capacitor shown in Figure P34.37. The capacitor's electric field is = (1.3 105 V/m, down) and the distance between the plates is 31 millimeter. (Image Attached) The...
  44. P

    How Does Electric Force Affect a Proton's Energy and Momentum?

    [b]1. A proton has a mass 1.7x10^-27 kg and its speed is v=.969c. When an electric force acts on the proton and does 5.8x10^-9 J of work on the particle, what are the following values? A) Particle energy B) Particle Rest Energy C) Particle Momentum D) Particle Beta [b]2. Particle...
  45. M

    Neutron Proton Hit: What Happens to Electron?

    Hi everybody When fast neutrons hit isolated protons (eg. hydrogen cores in paraffin) the neutrons kinetic energy is transferred to the proton (as they have aproximatly the same mass), which is detectable by a geiger counter, while the neutron is stoped. Thats how far I got after several...
  46. N

    Finding time of a proton travelling in an electric field?

    1. There is an electric field with two plates, one positive one negative, having a distance of 4.5x10-3 metres apart producing a charge of 200N/C. How long would it take a free moving proton to travel from the positive plate to the negatively charged plate? 2. ? 3. I solved for voltage...
  47. D

    Calculating Average Force on Proton in Metal Film

    A proton (m=1.67x10^-27 kg) that has a speed of 5.0x10^6 m/s passes through a metal film of thickness 0.010mm and emerges with a speed of 2.0x10^6 m/s. How large an average force opposed its motion through the film?? can anybody give me a clue on where i can start?
  48. O

    Antimatter (Proton & Anti-Proton Annihilation)

    In Antimatter production in a labratory, does anyone know the principle element used to generate antimatter such as anti-protons?
  49. W

    Accelerating Proton: Calculating Speed and Kinetic Energy

    Homework Statement A proton (mass m = 1.67x10^-27 kg) is being accelerated along a straight line at 2.0x10^15 m/s^2 in a machine. The proton has an initial speed of 2.4x10^7 m/s and travels 2.5 cm. (a) What is its speed? (b) What is the increase in its kinetic energy? The Attempt at a...
  50. E

    How is the Proton to Neutron Ratio Calculated After the Big Bang?

    As I understand it, it can be calculated that 1 minute after the big bang, when protons and neutrons freeze out and are no longer being created, that for every neutron that exists there are 7 protons. Does anyone know what equation is used to calculate this and if it is not a equation that is...
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