Protons Definition and 337 Threads

Sombody told me pictures of atoms are fake can you view them somehow, like without making an equation that says what they look like?

If you were to have a collection of protons in vacuum with no electrons there, would they give off or absorb light and or any other spectrum?

Homework Statement A very thin beam of protons is injected at non-relativistic velocities in a circular particle accelerator of radius R. The mass m and the charge e of the proton are known. The initial current in the accelerator is I and the total number of particles is n. The magnetic...

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...

Homework Statement A proton that is accelerated from rest through a potential of 20.0 kV enters the velocity filter, consisting of a parallel-plate capacitor and a magnetic field, shown below. http://capa-new.colorado.edu/msuphysicslib/Graphics/Gtype61/prob09_velfilter.gif The E-field...

I'm watching a documentary on the L.H.C and it struck me as odd when the narrator mentioned that the L.H.C. would be able to create the types of temperatures and pressures that were present at the big bang beginning. I found it odd that two protons could recreate those conditions.

I've read that some protons in the Universe can have an energy of about 10^{20}eV, or in English, about a well-hit tennis ball. (The cosmic rays). Is it possible for these rays to reach our brain? Or more precisely, what would happen if one gets hit by such an energetic particle? P.S.: I...

Homework Statement At very high temperatures (as in the early universe), the proton and the neutron can be thought of as two different states of the same particle, called the “nucleon”. (The reactions that convert a proton to a neutron or vice versa require the absorption of an electron or a...

Homework Statement Two protons are moving directly toward one another. When they are very far apart, their initial speeds are 3.00*10^6 m/s. What is the distance of closest approach? Homework Equations The Attempt at a Solution I really need help in question. I need to know how to...

Hi, There are 3 Protons (P) that form a triangle. distance PA-PB -->15mm distance PB-PC -->20mm distance PA-PC --> unknown I have to calculate the last distance and the forces between the protons by using coulomb´s laws. I tried to calculate the force between AB and BC: F1=1.02 E...

Could someone please explain to me why stationary neutrons may radioactively decay but protons may not? Thank you in advance :)

Homework Statement If a proton and an electron are released when they are 8.00×10e-10 m apart (typical atomic distances), find the initial acceleration of each of them. Homework Equations F=ma F=kq1q2/re2 F=kee2/r2 The Attempt at a Solution Since r=8x10e-10, I solved for the...

Homework Statement 1.Assuming that only gravity is acting on it, how far does an electron have to be from a proton so that its acceleration is the same as that of a freely falling object at the Earth's surface 2.Suppose the Earth were made only of protons but had the same size and mass it...

I'm curious about the nature of the evidence for three quarks -- two up and one down -- in the proton. I assume the data is derived from high energy scattering experiments, and looking at the angles and momenta of the scattered particles. But I don't see how, from such experiments, one can say...

I heard that protons and neutrons, as well as electrons pop into and out of existence. Is this by experiment, or mathmatics. Thankyou

I thought protons couldn't decay and I am pretty sure I've read it a few times as well but then with B+ Decay: p -> n + e + v :confused: Doesn't seem to make sense to me

1. In class we are discussing sub atomic particles and I approached my teacher with this question: If a electron is 2000 times smaller (roughly) than a proton, then the concentration of energy in the electron must be roughly 2000 times greater correct? She informed me that the charge to mass...

Homework Statement In a certain accelerator, protons of kinetic energy 1.6 x 10^-7 J move round a circular path of diameter 2000m . Calculate: (a) the centripetal acceleration (b) the mass ans for a is 9x10^13 ms-2, for b is 1.78 x 10^-24 kg Homework Equations centripetal...

what causes the protons inside the atoms nucleus to stay together(next to one another), positive repels positive, therefore they should repel each other,

Homework Statement Hey , I am a new member Here . I am having some diffuculties , i did one problem and still 1 problem i can't do it coz it seems very hard as i am new to gauss's Law I am doing college physics II , protons are projected with initial speed of v0 = 9550m/s into a region in...

Hey guys this is my first post on Physics Forums, be gentle. I've been wondering, what's the current explanation of why protons and neutrons have such very similar masses? Is this due to a difference in the up and down quark masses or is there something else going on here? Thanks

Hello! Does anyone have any ideas as to what would happen if 2 protons were accellerated to or just below the speed of light, fired (in a vacuum) in opposite directions to one another so that they would impact on each others side, not directly but rather in glancing fashion with a...

Homework Statement A Cyclotron is accelerating proton, where the applied magnetic field is 2 T, the potential gap is 100 KV, then how much turn are required for a kinetic energy of 20 MeV... (a) 300 (b) 200 (c) 150 (d) 100

I have been thinking about this for a while, and I am not sure about how I can visualize this. Lets imagine that there can exist clouds of primordial matter, far away in space. 1. Can it be possible for a cloud to exist and be made out of strictly protons at 0 kelvins? I don't...

This might be a silly question, but do protons and neutrons have a wave function that they can be described by?

At t = 0, 10^5 noninteracting protons are known to be on a line segment 10 cm long. It is equally probable to find any proton at any point on this segment. How many protons remain on the segment at t = 10 s? Attempt at Solution We can create a wavefunction for this scenario: \psi(x, 0) =...

Quick question, regarding mass-energy equivalence (e=mc2) and matter creation. Knowing that there are many concete visual examples of matter turning into energy using Einstein's equation, how do you use energy to create matter? If I'm not mistaken, I believe electron-positron pairs are...

Homework Statement The problem states that two protons are aimed at each other with a certain velocity v. It asks what is the maximum electrical force they will exert on each other. The velocity is given at 1000km/s. And that is everything given. Homework Equations KE = 1/2mv^2 F =...

[SOLVED] speed of two protons (I think an easy question) Homework Statement If you release two protons from rest 1.500nm apart, calculate the top speed, relative to you, that either proton will achieve. Homework Equations F=ma ke^2/r=mv^2 where k=9.0e9 Nm^2/C^2 and e is the charge...

Styrofoam is a polymer containing carbon and hydrogen. Assume the formula is C8H8. How many molecules are in a 0.2 g styrofoam peanut? How many protons and electrons are in this peanut if it carries no excess charges? How many coulombs of positive and negative charge does this represent? If the...

1. I have ^{9}Be^{+}, ^{12}C, and ^{15}N^{+++} isotopes, and I need to find the total of protons, neutrons, and electrons. A = Z + N, where A is the atomic mass number and Z is the number of protons and N is the number of Neutrons. 3. I know this is an easy question, I put it in physics because...

Homework Statement Two protons that are very far apart are hurled straight at each other, each with an initial kinetic energy of 0.16 MeV, where 1 mega electron volt is equal to 1x10^6 multiply (1.6x10^-19) joules. What is the separation of the protons from each other when they momentarily...

[SOLVED] using electric force to calculate number of protons Homework Statement a hydrogen nucleus and a nucleus of an unknown atom are stationary, 5.0x10^-10m apart, the electric charge on the hydrogen nucleus is 1.6x10^-19C. express the charge you have calculated for the unknown nucleus...

[b]1. Calculate the electric force between 2 protons in a nucleus that are 5*[10]^{-15} m apart. Compare this with the gravitational force between them. Homework Equations F(sub g)={GM(sub 1)M(sub 2)}/r^(2) G=6.67*10^(-11) Nm^(2)/kg^(2) Mass of proton=1.67*10^(-27)Kg The...

[SOLVED] Cosmic Ray Protons Homework Statement Earth's atmosphere is constantly being bombarded with cosmic ray protons that originate somewhere in space. If the protons all pass through the atmosphere, each square meter of Earth's surface would intercept protons at at the average rate of...

Sorry if this is a really easy question, but in biology I don't normally deal with these matters, just confused about this. Why is it that the mass of the electron is so much smaller than that of the proton or neutron, but the charge is similar to the proton (but opposite)? I'm assuming it has...

Homework Statement A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8450 N/C. The mass of the water drop is 3.80 10-9 kg. (b) How many excess electrons or protons reside on the drop? Homework...

On another recent thread a claim was made about the size of an electron being particularly small (maybe a point). I was unclear what that means. I thought that an electron was rather "smeared" in an orbital or wavefunction. So does the "size" of the electron refer to its size after the...

[SOLVED] Is it the protons or electrons that are responsible for an element's propert On a chemistry test I took, there was a question that asked "What subatomic particle is responsible for an element's physical and chemical properties"? I picked the "proton" as the answer choice, but the...

Dr. A. Chou of the Auger Ultra High Energy Cosmic Ray detector announced today that the last three years of partial information has been analysed to show at the 95% confidence level, UHECR's are caused by protons from Active Galactic Nuclei. Dr. Chou presented his data to the conference on...

Homework Statement I have to protons coliding - they have same magnitude of velocity and momentum and they collide head-on: p + p -> p + (p + p_) (the "p_" is an anti-proton). I have to find the minimum combined kinetic energy of the two protons for this process to run. The Attempt at...

Homework Statement In a fusion reaction, the nuclei of two atoms join to form a single atom of a different element. In such a reaction, a fraction of the rest energy of the original atoms is converted to kinetic energy of the reaction products. A fusion reaction that occurs in the Sun...

What would the chemical name for 12 protons and 10 electrons? This has been bugging me forever!

Homework Statement Two protons that are very far apart are hurled straight at each other, each with an initial kinetic energy of 0.16 MeV, where 1 mega electron volt is equal to 10^6*(1.6*10^-19) joules. What is the separation of the protons from each other when they momentarily come to a...

Homework Statement state the number of protons electrons and neutrons of these: Magnesium-25 Cu-65 Homework Equations protons is the same as atomic numbber, same with electrons. NEUTrons is atomic number - atomic mass The Attempt at a Solution Magnesium-25 Cu-65...

[FONT="Comic Sans MS"] Hello guys, can you help me on this question: What accounts most for the spin of protons? I think the quarks only contribute a few percentage for the spin, but I'm wondering if there are new discoveries about the main cause of proton spin thx!

Homework Statement A proton is confined in a uranium nucleus of radius 7.41 fm. Determine the proton's minimum kinetic energy K less than or equal to delta K according to the uncertainty principle if the proton is well approximated by a Gaussian wave packet confined by the nuclear diameter...

Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 8.90 cm-3 and their speed is about 490 km/s. (a) Find the current density of these protons.(b) If Earth's magnetic field did not deflect the protons, what total current would Earth receive?For part a I...

Someone once said that a positive hydrogen ion in a solution is not just a proton. When queried he replied by explaining that a positive hydrogen ion in solution will have a relatively high charge density because of the small ionic radius. I can't see any difference: a proton and a positive...

Homework Statement A point charge q = -0.80 nC is fixed at the origin. Where must a proton be placed in order for the electric force acting on the proton to be exactly opposite to its weight? (Let the y-axis be vertical and the x-axis be horizontal.) Homework Equations F=(kq1 q2)/r^2...