Weak Definition and 473 Threads

This is the question: "An electron is released from rest in a weak electric field given by vector E = -1.80 10-10 N/C jhat. After the electron has traveled a vertical distance of 1.2 µm, what is its speed? (Do not neglect the gravitational force on the electron.)" So far, the only approach...

Homework Statement How do we determine whether we have a strong or a weak interaction? (for the following processes) For example we have a reaction K^{-}+p\Rightarrow \Xi^{-}+K^{+} or another example K^{+}\Rightarrow \pi^{+}+\pi^{0} thanks!

Hello, can anyone help. Does the strong force affect the weak force in any way. Or do both not interact with each other. Thank you.

Homework Statement 0.5332 M CH3COOH 0.1219 M CH3COONa 0.100 M H2S 0.41452 M NaOH what is the pH of the resulting solution? Homework Equations CH3COOH Ka=1.75E-5 H2S Ka1=9.6E-8, Ka2=1.3e-14 The Attempt at a Solution I know that neutralisation will occur, but there is not...

Homework Statement Considering the n = 2 states of hydrogen: In the absense of an external field, the four j = 1/2 states are degenerate. Using degenerate pertubation theory, I am supposed to show that for a very weak field the Stark effect shifts the energy levels by \mp \sqrt{3}a_0 e...

Can someone point me to a reference that explains how the (effective) running coupling behaves in the weak interactions(at 1-loop order). I couldn't find it... If I understand correctly, than the coupling is g = \frac{e}{sin(\theta_W)} where e is the QED coupling, which increases with energy...

Recently while working with electromagnet , we noticed one thing. I we bring strong magnet near very weak PM or electromagnet, It will attract the weak one whatever is the polarity of magnets. we increased power to electromagnet then it was giving repulsion. I did't understand this...

For a leptonic weak interaction diagram, we have an election converted into a neutino and emitting a w- particle. But only left handed part should undergo weak interaction. So basically you should have the left handed part of electron converted into a neutrino(left handed) emitting a w-...

can particles be "weak force" charge neutral? In the standard model we have fermions of various electrical charges, including neutral. In some sense, we can consider right handed electrons as "weak force" neutral, however the mass term kind of "mixes" the left and right handed. Is there...

Gravitational force between masses is given by the law of universal gravitation. Electrodynamics force between electric charges is the Lorentz force. Nuclear force between nucleons falls off exponentially with rising the distance. The force between quarks grows in proportion to the distance. Can...

hi, let's suppose 2 electrons are far away each other and therefore they interact very weakly. i wonder if in such case there are as many virtual photons in the case they are very close to each other? because i know that only 1 electron in complete vacuum generates an electromagnetic field and...

I have been given the impression that the weak force is what holds the neutron together (preventing it from decaying to an electron and proton) and that the neutron eventually decayed, despite this weak force, by 'tunneling out' Is that right or am I way off?

Homework Statement I'm a little confused, let's say i do a titration curve for a weak acid, at some point there's a buffering range near the pKa. Like i know that if we add a strong base like NaOH to acetic acid in a water solvent, then the OH- will combine with the H+ (hydronium ion) which...

how to calculate the pH of a mixed solution containg 0.200M HA and 0.2 HB ka of HA =1.0^10-5 KA OF HB = 1.0^-6

I've seen numerous rigourous/conceptual explanations of the difference between convergence in probability (weak), and strong, almost sure convergence. One explanation my prof gave was that convergence in probability entails: \lim_{n \rightarrow \infty}...

Homework Statement In my textbook, they don't necessarily explain what happens when we add a base to a weak acid (e.g. acetic acid)...so I was wondering if anyone can tell me if I got it down: -Like if we have acetic acid (which is a weak base) in water, it will form an equilibrium and...

So I've been playing around with different electroweak lagrangians (sourceless, higgsless, unbroken, broken, etc), and finding the equations of motion for them. Everything looks about right, but the issue I'm having is when you add in the masses of the weak bosons(no higgs though).This breaks...

Can someone explain in layman terms the purpose/function of the weak nuclear force?

I was looking at the list of the force carrying particles and all of their masses read zero other than the W boson of the weak nuclear force. Q: Does the W boson travel at the speed of light even if it is massive? (I am guessing not) Q: If the W boson is massive then it emits other gauge...

I have heard that the coupling between Higgs to matter is weak, that it is a correspondingly weak effect. If this is true, is there any way that that effect can be made weaker or stronger? Or asked another way, what is it that sets the magnitude of the level of effect? Thanks

Anyone know what causes the weak gravitation field at the bottom of India / Indian Ocean (see link below)? Thanks http://news.bbc.co.uk/2/hi/science/nature/8767763.stm

I have the next decay: B^0 \rightarrow D^+ e^- \nu_e The question is: employ CP symmetry on the particles in this process, what reaction would you get? and what would happen if CP symmetry breaks? Now if I employ CP symmetry I get: B^0 \rightarrow D^- e^+ \bar{\nu_e} But in my...

I understand that the Colour Force is described by Quantum Chromodynamics, Electromagnetism is described by Quantum Electrodynamics and Gravity will hopefully be described by a Quantum Gravity Theory but currently General Relativity. But what Theory describes the Electroweak Interaction? Is...

Dear all, would anybody know of references regarding experimental constraints on the running of the weak coupling ? This running is rather slow, and I guess we do not have evidence one way or the other, but since the SM and the MSSM have opposite slopes, I'd like to see what kind of...

I just read something about the creation of deuteron in the first step of the pp cycle. Given that you have the reaction: p + p -> d + e^+ + v_e, where e^+ is a positron and v_e is an electron neutrino. Since there is a neutrino present, it is a weak interaction. In addition, as the interaction...

I've attached a feynman diagram i drew myself because i can't find a proper feyman diagram for this decay. I assume that since the decay K+->u+ + Vu is weak it goes via a W boson. Is this diagram correct? thanks

I'm losing my mind trying to differentiate spin, isospin, weak isospin; then there's chirality, helicity - i must be dyslexic and quantumly challenged. Since it would be a monumental undetaking to do this online, does anyone know of a reliable source i can access online (other than wikipedia...

The electromagnetic force is mediated by photons , which have 0 mass. so electromagnetic forces have infinite range. the weak force is mediated by three intermediate bosons, W+, W-and Z0 particles. these all have mass, the two W particles about 80GeV and the Z is about 90GeV. the bit below is...

I know this may be a naive question but here is my situation. I'm going back to undergrad this fall for a 2nd bachelors degree in Physics, so I'm planning on getting a head start by taking Calc II and Physics I with calc at a community college this summer. I plan on applying to grad school in a...

Homework Statement A particle is in a box of length L on x-axis. 0<x<L. What is the first order shift due to V(x) of the wavefunction? Homework Equations H=p2/2m Sin=sqrt(2/L)cos(npix/L) En=n2pi2hbar2/2mL2 V(x)=kx2/2 The Attempt at a Solution I'm super confused because the shift in the...

Homework Statement A particle is in a box with length L. A spring attached to the particle is fixed at x=0. How can we determine the potential due to the spring is weak? Homework Equations H=p2/2m Si(x)=sqrt(2/L)sin(npix/L) En=n2pi2hbar2/2mL2 V(x)=kx2The Attempt at a Solution If I base...

Is it possible to do well in upper level physics classes with a weak foundation in differential equations? I've never taken a DiffEq class. Some of the extreme basics were covered in Calc 2, and there will be a crash course in DiffEq in my Mathematical Methods in Physics class (using the Boas...

is the weak nuclear force what binds atoms together to make molecules?

Hello; I don't know a lot about the weak nuclear force, so I wanted to ask if some of these statements are correct; -The weak nuclear force is what is responsible for radioactive decay -When alpha and beta radiation occurs, the W+, W- and Z0 bosons are what carry the radiation force -The...

The question below is a rather theoretical one and does not concern any actual calculations. So I have decided to abandon the traditional format. In the past few weeks, I have designed and carried out a lab in which I would test the resistance of a strong acid (0.5 M HCl), a weak acid (0.5 M...

I've had trouble understanding how the weak interaction could be field based, like classical gravity, or electromagnetism. My limited understanding of the interaction so far had been that left handed leptons and quarks would have an event spontaneously happen to them (such as decay). I thought...

You still have not answered the question; What are the two forces of the weak angle coupling constant? We have spin and charge as known forces. If you can not specifically identify spin or charge as one of the two forces involved in the weak coupling constant than for all you know there...

Homework Statement hy guys ,help me prove if x<y and n is odd ,then xn<yn i have solved this . .but a question in below Homework Equations The Attempt at a Solution if 0=or<x<y then xn<yn (i have proved this ) and if x<y<or=0 we can say 0=or<-y<-x it implies -yn<-xn...

Hi! My lecture notes make me really confused as to what is the difference between weak and strong equivalence. I also read about it on wikipedia, but I'm still not sure. Can anyone give an example how in real life (thought experiment?) of what weak and strong equivalence is.

Just a thought: If we could identify the position and velocity (via weak measurements) of a particle at some instant, and its future evolution is fully determined (at least in principle, not in practice), then can we extrapolate this to surmise that all events are are inherently deterministic...

I have 2 questions... I was told that the transmutation of Li-7 to Be-8 by proton collisions at energies below the classical barrier verifies the QM description of the weak interaction cross section. Firstly, I found the leap in logic very confusing - does the weak force have a role in...

Homework Statement A 0.149 g sample of a weak acid (HA) requires 16.80 mL of 0.110 M NaOH to completely reach the equivalence point. What is the Molar Mass of the acid? Homework Equations ... The Attempt at a Solution i don't think i did it right. i just did 0.0168Lx0.110M=...

Homework Statement Consider a titration in which 50.00 mL of .450 M benzoic acid, C6H5COOH, is reacted with 0.2000 M Ca(OH)2. What will the pH be when 60.00 mL of Ca(OH)2 has been added?Homework Equations 2C6H5COOH + Ca(OH)2 -> 2 H2O + Ca(C6H5COO)2The Attempt at a Solution I have determined...

Hi, Im currently writing a theory section for the W and Z bosons mini thesis type project, I am looking to fully cover the main topics in this area and am wondering if i am missing any or need to re-order things: Overview of elementary particles Symmetry and conservation laws Gauge...

Hi ! i am new to these forums.. so i just want to ask whether i am posting my query in the correct forum?? I have a doubt regarding this weak acid - weak base buffer. When the moles of Acid > Base, We use the formula pH = pka + log10 ([salt]/[acid]) to calculate the pH of the Acidic Buffer...

what is the weak field limit?

For the process where two neutral pions turn into two charged pions, I noticed that this can occur through both the strong and weak interactions. Through the strong interaction it is a 4-pion vertex, and through the weak interaction it involves a virtual W-particle. If I were asked on a quiz...

When it is said that the relative strength of weak interaction is \ 10^{-5},what does this mean? On calculation I am getting \alpha_w=\10^{-3} with \ G_F=\ 1.16\times\ 10^{-5} \ GeV^{-2} I had an impression that \alpha_w should be \ 10^{-5}.Which one is correct?

Hi again, Thaks for previous help. I am self studying GR using Schutz and Dunsby's webpages & notes. I am stuck on a step in the derivation of the weak field approximation. They approximate the metric with g[a][/b]=n[a][b]+epsilon h[a][b] In step 7.30 the partial derivative h[i][0],[0]is...

[SIZE="5"][FONT="Georgia"][FONT="Franklin Gothic Medium"]I don't have a formal education in physics so please excuse my ignorance. I had an idea and was wondering if as matter gets stretched and spun toward the event horizon is it possible that as it is consumed the weak force is repelled while...