Recent content by ALime88

Hello, does anyone know of any good resources for solar path data? Like what angle in the sky the sun is at for different parts of the year. Thanks, AL

Hello, Damn Griffiths 3-star problems... The setup for the potential is a 2D cross basically, so there's a column of zero potential 2a wide (straddling the y-axis) going to +/- infinity, and there's the same thing on the x-axis, so they cross over the origin. Everywhere else the...

Proportional to \frac{1}{n^2} I meant... wrong slash

Oh I what you're talking about with the cosines. Anyway the answer is not zero. The answer is (as can be seen in Griffiths) proportional to [tex]\frac{1}{n^2}[\tex]

They are sines, not cosines. (sin(\frac{m\pi}{2}))^2=1 for odd m.

Sorry VC, didn't mean for that to sound rude.. just wondering if I might be doing it wrong.

Ok... E^2_{n}=CONSTANT\sum_{m=1,m\neq n}\frac{(\sin(\frac{m\pi}{2})\sin(\frac{n\pi}{2}))^2}{n^2-m^2} This is it. And it's the right side of that equation that I can't solve. Hey VincentChan, why did you think it was summed over n as well?

Hey guys, the sum should NOT be over n. The problem I'm doing actually is Griffith's 6.4, and I'm looking for the correction to the nth energy level, so the n stays in as the index variable. Also, the sinusoids are multiplied, then squared on top, so they will only ever be 0 or 1. So I guess...

I thought about it and scanned some textbooks, and no I don't know how to solve that... I'm sure I could figure it out relatively easily, so how could that help with the initially stated question?

Yeah that's exactly it! Sorry for not posting it in such a clear form... Is there a built-in equation editor in the posting process??

Hey there, I'm working on a perturbation theory problem, and I have no clue where to start in solving an infinite series. It's an infinite square well with a delta function potential in the centre and I'm trying to find the 2nd order energy correction to Energy En. Anyway, what I've got is...