Recent content by loba333

Oh yeah thanks. I sorted that first one out. That makes sense to integrate over all space, how ever now I'm really confused as the integral has a r^3 value in it. it says you can use the identities at the bottom (http://imgur.com/MSG1i) but i swear they don't hold as it doesn't include a...

just realized i didn't square a when finding the expectation value of r . Still it comes 0.5aB, any idea where the 3 comes from ?

So I'm getting the right answer for the energy now, even though the correct answer appears to have set A to 1 or its just not included in the final solution ? Also have i normalized the WF correctly. For the next part we have to find the expectation value of r and I am getting an odd answer...

Of course, sorry that was a silly mistake. Also the potential should be negative. another clumsy mistake. Thanks TSny I will recalculate now

well i was wrong. thanks DocAl. Do you know anything about QM? do u think you could help me out wit my most recent post ?

I think what DocAl is getting at is in the observers reference frame you can use v=s/t as your just trying to find out how long it takes for the meson to travel that distance. This is how long it will take as seen by the observer, however the clock on the meson is ticking much slower and...

Homework Statement Hi guys the question is "Write down the time independent Schrödinger equation for the hydrogen atom, and show that the wave function Ψ(r,θ ,φ ) = Ae(−r / aB) is a solution. (A is a normalization constant and aB is the Bohr radius.) What is the energy of the state with this...

Homework Statement Heres the problem: Homework Equations F=BIL F=qvB The Attempt at a Solution I really don't know where to start. Can you guys give me a hand. Maybe a link to a web page explaining. I understand if it were convention current flowing through the 'pipe' it would experience a...

Not quite sure how to derive it and I didn't even know I'd done the answer to part (ii) :X

Homework Statement Homework Equations {\phi} = \int E dA = \frac{QL}{\epsilon_0} The Attempt at a Solution I'm aware of the definition of Gauss's law of electrostatics (however evidently I'm not very good at applying it), but I can't seem to fully answer the rest of the question...

My textbook tells me that the formula is I=\frac{1}{3}Ma^2 Where a is width (in this case 0.85m). Plugging in the numbers give me I=8.7513 which is pretty much the same. Thanks a lot for the help, keep up the good work! :D

Thanks alot, I used the method you provided (alot less daunting than it looks) and I got the answer above your post, does it check out?

Right I get a value of I=8.76375 kgm^2

I'm pretty much aware of what you've said, although you explained it nicely however how am I supposed to calculate the dV needed to complete the calculation for this case? EDIT: Posted this at the same time as your above post, going to read it through. EDIT2: Ah yes this is exactly what I had...

Homework Statement Homework Equations I=p\int_{0}^{0.85}r^2dV where p is density and r is perpendicular distance from the axis of rotation. dV=dxdydz The Attempt at a Solution I'm not sure where I'm going with this one as it seems I'll have to integrate dx*dy*dz which is kind of confusing...