Recent content by physics369

A few questions... 1) Does an electron have to have the exact amount of energy to cause excitation, or can it have more (i.e. can the eV of an incoming electron be equal or more than the excitation energy required for excitation of an atom to happen)? If so, does the electron that collided...

Can someone tell me why this is the strong force if quarks were changed? Pion- + p ---> K+ + Sigma- Surely there would have to be a quark change in that: d(u) + uud ---> u(s) + dds Where (u) refers to it being anti-up ??

Thank you. :) So when you say "involved" that means both in the reactants, and the products? I'm dealing with the proton, neutron, pions (+/-/0) and kaons (+/-/0) and their antiparticle companions - so for the purpose of my exam, can I say that all hadrons that I'm dealing with are: -...

Okay, so can leptons be produced by a strong nuclear decay? Can you give me an example of a strong nuclear decay?

Oh, okay. So the quarks themselves aren't changed, but they're just re-arranged so that you get different particles? Is this called decay?

Hi! So then why does this occur via the strong interaction: +ve pion + neutron ---> proton ?!

I'm not using the template because, again, it's not a question I need help with, it's understanding the topic so I can actually do the homework. :P First of all, is interaction completely different to decay? Because all hadrons interact by the strong interaction, and yet they can decay into...

I haven't used the template because I just need some reassurance on understanding a topic, not help with a question! When two particles annihilate (e.g. proton and antiproton), the resulting radiation will have a minimum energy of the sum of the rest mass energies of the two particles, right...

Homework Statement In an atom, an electron goes from the 4th energy level (at -0.26J x 10-18) to the 3rd energy level (at -0.59J x 10-18) and a photon is subsequently released. How do you work out the frequency of the photo and its wavelength. Homework Equations E=hf wavelength...

Homework Statement State the magnitude of the terminal potential difference between two supply terminals which are connected to a piece of lead with negligible resistance. The EMF of the circuit is 5000V with internal resistance of 2,000,000 Ohms. I don't really understand what "magnitude"...

Hi, Sorry if I have posted this in the wrong place. I'm having trouble understanding the difference between these four measurements of charge. Specifically whether the -/+ sign is important and what the unit is: For example, The charge of an electron is -1.602176487(40)×10^-19 coulombs...