Interactions Definition and 291 Threads

Hello everyone, I am kind of new to this forum. If this post belongs elsewhere, please tell me, thanks. 1. What are mediators? Are they particles? Why does the four fundamental interactions each have one or more associated mediators? Moore (my textbook's author) writes: “Each interaction as one...

Homework Statement Imagine that I throw a ball toward the floor. It hits the floor and rebounds upward. What type of fundamental interaction between the atoms of the floor and the ball causes the ball to rebound upward? a. Strong nuclear b. Electromagnetic c. Weak nuclear...

Hi, I am looking for table or something that gives a tumb of rule for van der Waals distances - I have some C C spatial interactions which I would like to determine if their interaction contributes to the total energy or should I calculate it with a Lennard-Jones potential to get an...

Before someone accuses me of being a half-wit attemtping to explore fields way beyond my intelligence, I'll just come straight out right now and say: "My highest level of education is that of a high school graduate"! I am however, on a very serious trip to learn as much as I can about the...

Whenever a process yields a photon, an electromagnetic interaction is involved. If a neutrino comes out, a weak interaction is responsible. Is there any way to see from the ingoing and outgoing particles if a strong interaction is involved?

Homework Statement A magnet is hung by a string and then placed near a wire as shown. When the switch is closed, the magnet rotates such that the ends of the magnet move as indicated by the arrows. At the instant the switch is closed determine: a) the direction of the current through the wire...

Say you (somehow) constructed a very long, sturdy rod, about a light year in length. Say it was made of unobtanium, so it has the same mass as a relatively short steel rod. Now say there are two astronauts, one at each end, and one of the astronauts gives the rod a firm push in the direction...

Hello! I was wondering if anyone could provide me with any advice on a better interatomic potential than the Lennard-Jones (Mie 6-12) potential for carbon-carbon interactions. I know that L-J fails for metals, but I am not sure how good it would be for carbon-carbon interactions. Are there any...

Can QFT be used to anything else but particle collisions? Particle collisions seem to be the major application of the theory, but it hasn't become clear to me if it works for anything else.

There is something I do not quite understand with regards to the so-called non-locality problem in EPR like experiments. The wave function propagates at c, so even when two particles, that are part of the same quantum system, move in opposite directions they are still connected. They both...

Hi, I'm not sure if I'm at the right place to write this message, so please excuse me if I'm not. I have read a bit about tidal forces, but I still don’t understand what they are, how they act on different body masses, etc. So, I thought I could find answers here. I would greatly appreciate it...

Hello I'm trying to picture various light based experiments as described from a frame that is in motion with respect to the experiment devices. For instance the reflection of a photon in a light clock: the atoms (and their fields) that constitute the surface of the mirror are squashed. How...

The question verbatim is: "A portable device for pressurising tyres consists of a small container of 1.5 cft volume, initially filled with, say, CH4 at 500 psia. When a tyre (volume=0.5 cft) is to be filled, the gas is allowed to flow into it from the container through a valve till the pressure...

I am wondering how to calculate how far a neutrino would have to pass through a substance for it to have a probability P of interacting at least once. Water, for instance, has a density of 1 g / cm^3; using Avogadro's number I think this means that there is about 6.02 x 10^29 protons and/or...

Just curious. I know that antiproton will annihilate with a proton, but is that the only baryon which will react with a proton in such a way. Specifically, do the specific constituent quarks annihilate with their antimatter counterpart or do they only annihilate in the proper 2 and 3 quark...

Hi, this may seem like a ridiculous qn.but,we can explain gravity on the basis of the curvature of 4D spacetime.can we explain the EM,weak and strong interactions similarly on the basis of dimensions?

First time visitor to this cool little forum we have here. So I'm trying to figure out how to determine the cross-section of Compton Scattering and Pair Production when a high energy photon interacting with the Coulomb field of an atomic nucleus. I see a lot of pretty charts and/or values...

Can gravity be explained by exchange interactions? I am supposed to give a presentation on it, so some explanation as to why or why not would also be very much appreciated. Thanks very much in advance.

example: 2 protons collide and a down-antidown quark pair is created, giving a pi-plus meson, a neutron and a proton. with all those quarks knocking around, are there specific rules saying which particles are formed from them? like, what stops there being a pi-zero meson and 2 protons? or any...

Ok, i have recently been trying to learn a lot about light, and I have found that the reason the speed of light is slower in dense materials is because of the photon-atom interactions. However, I have also been taught that when a photon is absorbed by an atom that an electron in that atom...

http://home.hetnet.nl/~inthepicture/quarks/" I personally find this a brilliant way to visualise particles, but don't think there's any "truth" in the symbols, any more than there's "truth" that antiparticles in Feynman diagrams are really particles that time travel.

1 to 2 Interactions, or "explosions" I'm stuck doing this problem on my physics homework.. it's different than the type of problems we have been doing in class, and he hasn't taught us the equation to solve this question. The problem is: Tim, mass 50.00 kg, is riding a skateboard, mass 2.00...

Author: Dr. Donald Luttermoser of East Tennessee State University

What holds the neucleus together? What is the interplay betyween strong , weak and electromagnetic forces in holding the neucleus together? how do these forces fit in with the liquid drop model od the neucleus? What is the expeted speeds of neutrons and protons within the neucleus? what are the...

Cart A and B are equal mass ( 500 kg each) and have frictionless wheels. Cart A has a spring attached to its end with a constant 2000 N/m. Cart B has a spring constant attached to its end with a different spring constant. They both sit on a track with their spring facing each other, and are...

Please excuse an ignorant question, but does this ghostly zero point energy have any effect on real world particles?

I read that photons can interact with electrons, atoms or simply disintegrate. The four cases I came across are. 1. Compton scattering. 2. Photoelectric effect 3. Knock an electron to a higher energy state in an atom. 4. electron-positron pair production. While I understand each...

i need help with my nuc engineering homework due tomorrow. here is the link for hw1 in the course schedule. http://www.nuc.berkeley.edu/courses/classes/NE39/index.htm if anyone can help me with problems 2 and 3, email me at lml841@juno.com asap! thanks alot!

How do protein to protein interactions and/or protein-nucleic acid interactions underlie the cellular processes of Replication, transcription, and metabloism. Well i know that protein -protein reactions underlie all processes in the cell. For example i think in translation the ribosome is...

from my book it says: The chemical interactions of the mobile phase and sample, with the column, determine the degree of migration and separation of components contained in the sample. For example, those samples which have stronger interactions with the mobile phase than with the stationary...

Hello, trying to get my head around the (MANY) particles I'm learning about at the moment. First question is about quark colours. I understand the different types of quark (up , down, strange, charmed, bottom and top) but I don't understand how the colours work, why is it necesary for the...

I have two questions about neutrinos that I haven't been able to figure out: 1. The evidence seems to indicate that neutrinos have rest mass. Since it is invisible to charge and electromagnetic fields and, apparently, gluon fields, how does it interact with matter at all? I think it may have...

Instanious interactions and the intermedaite Hi all, I had some question evolving the atomic interactions of subsition reactions. For example OH- + CH3CH2Cl= CH3CH2OH + Cl- The intermedaite in this reaction is OHCH3CHCL The Cl is leaving at the exact same moment that the OH- is bing to...

hi i was just curious to find out how photons interact with protons (virtual and real) because as we know a photon excites an electron to a new state but what happens to a proton? also why don't electrons collide with the nucleus. i know they have acceleration which will keep them from...

There are two types of strings, closed and open, and they interact and stuff. How do these interactions affect matter or anything else?

Perturbation theory provides good answers as long as the contributions get smaller and smaller as we go to higher and higher orders. Then we only need to compute the first few diagrams to get accurate results. Is it possible for a perturbation series to get bigger then smaller then bigger-it...

Hello, I am researching sound at Concordia University, Quebec. Recently, my mind was wondering and I thought about sound being produced by the air molecules bumping into each other. I began to wonder what else could do the same thing. Does light have contact with the air molecules in this...

In most general sense the Archimedes' law of lever could be written this way: \frac{F_1}{F_2}=\frac{GM_1+kQ_1}{GM_2-kQ_2}=\frac{D_2}{D_1} ------------------------------------------------- F=force Q=charge M=mass D=equi.distance G and k are some proportionales Consequentially...

I am here to ask what anyone thinks on the concept of things beyond this universe, such as a multiverse, quantum inflations, or higher dimensionality. Thanks.

In this post I would like to discuss the "weight-principle". This is a rule-of-thumb principle, related to the power-counting principle of renormalisation, which says that different types of particles are given different "interaction weights" specifically the following: graviton:0...

For the purposes of this question, assume there are gravitons and they are the carrier of the gravitational force. I could use one of the other forces and leave out gravitons, but it's easier for me to envision this question using a very low strength force. Q1) -- For gravity to deflect the...