Recent content by Declan

Yeah, I searched everywhere in Modern Physics, by Krane, couldn't find any mention of it! Unless it's called something else... Anyway, so that seems to be pretty much what I suspected. Given some cross section, how many of the photons are interacting. But I still don't get it then...what does...

Well, so far we all agree about the first part. I really just need to know what "Photon interaction cross section" is. If I had to quickly guess, I'd say it's some some of flux of interacting photons. That makes sense for the Compton Effect, and pair production...but I can't really imagine what...

Photon interaction cross section? What?!? Hey guys-- I'm practicing for the GRE, and I came across a question that has stuff that's not even in my textbook! I haven't found much from googling either. Here is the question: My instinct was to guess (C) because graphs I had seen of the...

Hmmm. Read a bit, can't say I'm clearer on it. A question about thermophoresis, if you know the answer: once the gas has separated, it should roughly stay in place, right? As in, there isn't much convection going on, right?

Cool, I'll take a look at those. Thanks! Looking at the working examples my professor showed me, he the gas in between a plate at 300K and one at 2000K...with the plates being 1m apart. So, relatively, that's a waaay smaller temperature gradient. It's possible it breaks or something when...

Hi everyone! I'm simulating a gas mixture of He and Ar, and I'm trying to get them to separate via Thermophoresis. For clarification, http://en.wikipedia.org/wiki/Thermophoresis When I naively try it with what I have so far in my program, it exhibits Thermophoresis...but with the Ar going to...

Hmmm, thanks, I'll check them out. I actually like the idea of going to school in a different country, but I was advised against it for some reason. But I'll look at them!

Thanks, I'll check these out! Good target schools for me, probably.

I agree, people will disagree about the weather of Chicago. But even the ones who hate the cold will agree that it's a pretty buzzing city and a center of culture. That's actually something helpful I've been told before, about applying to places with lots of options, which I'm definitely...

He gave me a pretty useless answer in that he didn't actually suggest anything. He simply made a pretty snarky comment about how no one could suggest anything, despite the helpful post right before his. If someone "marvels" at something you said and it's clear they don't think it's actually...

He was a jerk to me without any good reason. I'm perfectly courteous to people until they say something as insulting and annoying as that. It's irrelevant that he has posted a lot on this website. If it helps, picture someone else saying the dumb stuff he did. It seems like common sense that if...

Thanks! Berkeley was already on my list, though you're right in that it would be a stretch for me. I've heard good things about UC Davis also.

Well, I'm actually going to dignify your oh-so-subtle patronizing and pretentious response with some thought, which was apparently something below your majesty. Right now I'm finishing up undergrad at a school that I like a decent amount. But there is only so much happening on campus at a...

I need a few safety schools, and most importantly a few target schools. I'll have no trouble coming up with reach schools. The problem is that I have no idea what to look for. I know I want to do Physics, but that's the extent of it. I have no idea what part of physics I'd like to do, but...

That's good to hear, I guess. In reality, I probably wouldn't mind staying in one place for a while if it was a good city and I had friends, but I really like the idea of traveling around for a while. Should I have ANY idea what part of physics I might want to specialize in by now? I've done...