Recent content by rshalloo

Hey has anyone had experience with a good book on Laser-Plasma interaction at a graduate level? I've seen a few on amazon and the like but they rarely have reviews so I have no idea how good they are. Thanks you!

What do you mean here, surely we would expect the Potential difference to tend to zero (but still remain finite) as the distance between the cylinders tended to zero? Obviously this has limits, this theory is not valid for instance on an atomic scale as we have assumed a continuous charge...

Too early for some of us across the globe! Thanks again. Your word is enough, I'm sure it makes sense physically because as d->2R the minimum it can be, the log tends to ln(1) which is 0. ie when the cylinders are touching there is zero potential between them? I know its just one case, but a...

I feel kind of silly now, you're completely right, I don't know why I was trying to get a general formula for the potential at a point s rather than the difference between the cylinders. Too close to the problem I suppose! (also thanks haruspex and rude man for seeing this too!) So...

Homework Statement Find the potential difference between two oppositely charged, infinite cylinders of radii R whose axes lie at $$y =+\frac{d}{2}$$ and $$y = -\frac{d}{2}$$ They have surface charge densities of magnitude $$\sigma$$ Homework Equations The family favourite - Gauss' Law...

Hey I'm currently an undergraduate Physics student in my third year. I wish to continue on with Physics and complete a Phd Preferably I'd like to avoid doing a masters, I've looked at a lot of threads on here and the general consensus is that with a three year bachelors (like the ones in...

Homework Statement So I'm having a bit of trouble getting my head around this concept and was hoping someone would be able to shed some light on it. I know the definition. i.e free charge isn't bound to a nucleus whereas bound is. But physically what difference does this make. i.e are free...

Homework Statement Hey I just want to clarify something. In particle physics, isospin is a flavor quantum number. Is it isospin or the z component of isospin which is conserved in particle interactions Homework Equations electron neutrino + proton -> electron pion+ + proton The...

Ah yes that makes sense! Thats really cool, I suppose sometimes when trying to wrap my head around these things I tend to forget how awesome their applications are!

So as opposed to what i would have considered a cross section to be before (a 2d slice of a 3d object) a cross section in terms of scattering is a probability that particles will undergo scattering? Surely they should have just defined a new word for that :P

I'm just wondering what the difference is between a cross section and a scattering cross section? Or is there any? I can't seem to find anywhere that clears it up, in fact there's a whole section on scattering cross sections in Kibble and Berkshire but they don't define it once :P

Homework Statement Let D=\{(x,y,z)| z^{2}=1+x^{2}+y^{2} , 1<z<3\} Compute\int\int_{D}zdS Homework Equations From lectures I know; \int\int_{D}\delta dS=\int\int_{D}\delta\sqrt{(\frac{\partial f}{\partial x})^{2}+(\frac{\partial f}{\partial y})^{2}+1}dxdy The Attempt at a Solution...

Ahh yes that makes much more sense now. Thanks very much for your help :)

I'm not sure we've covered that? (am attempting previous exam papers so it might have been on the course before) unless there's also another name for such an equation?

You could try building a cube frame out of popsicle sticks and suspend the egg in the centre that way the frame might be able to absorb some of the impact and because the egg is suspended by the tape, the tape will absorb some of the impact too