# Recent content by Sacroiliac

1. ### Symmetric, antisymmetric and parity

In case anyone's interested........... I finally found the answer to this question in Quantum Physics of Atoms molecules etc. by Eisberg and Resnick on page 315. I'd try to explain it but I don't think I can pull it off.
2. ### Symmetric, antisymmetric and parity

Let me see if I can make it clearer. Problem 5.5 In David Griffiths “Introduction to Quantum Mechanics” says: Imagine two non interacting particles, each of mass m, in the infinite square well. If one is in the state psin and the other in state psim orthogonal to psin, calculate < (x1 -...
3. ### Symmetric, antisymmetric and parity

Problem 5.5 In David Griffiths “Introduction to Quantum Mechanics” says: Imagine two non interacting particles, each of mass m, in the infinite square well. If one is in the state psin and the other in state psim orthogonal to psin, calculate < (x1 - x2) 2 >, assuming that (a) they are...
4. ### Differential forms. Why?

Thanks selfAdjoint. I just wish there were some way to start out with a simple example but I guess you can't do that until you've developed the mechanism.
5. ### Differential forms. Why?

I was reading lethe's thread on differential forms and suddenly it dawned on me that I had no idea what differential forms were for, or why the process was developed. Do they replace vector calculus, or are they a more powerful form of linear algebra or what? For me it is much easier to study...
6. ### Infinite wave train for an electron?

The normalization of the free (say, electron) in quantum mechanics is achieved by a trick with the dirac delta function. Typically we write the orthogonality conditions for u1=c*exp(i*k1*x) and u2=c*exp(i*k2*x) as: int(u1*u2)=delta(k1-k2) and then out pops the nomalization constant...
7. ### Tunneling and transmission coefficient

If an ensemble of quantum partcles, with energy E, traveling in x direction encounter a very wide potential barrier V0 > E, the ensemble wavefunction will exponentially decay within the barrier. I thought that meant that there was a small probability of detecting an electron within the...
8. ### Momentum is a mass's electrical resistance to change

But doesn't it take more force to accelerate or deccelerate a charged body? The electromagnetic energy of the radiation has to come from somewhere. So wouldn't that mean that a charged body has higher inertia and momentum?
9. ### Energy and postion in QM

Are you saying that as the particle gets closer to the nucleus its potential energy decreases but because it is more localized the HUP causes its momentum to increase and exactly offset the decrease in Potential energy? PMB I didn't understand your post. Sorry.
10. ### Energy and postion in QM

In the hydrogen atom the 1s orbital has a clearly defined energy of 13.6 eV, but the probability density and radial probability density says you are liable to find the 1s electron anywhere from the nucleus on out. How does this exact energy value jive with this variable position?
11. ### Inertial mass of a stressed body

Sorry that last post was by Sacroiliac not Ring. He and I post from the same computer and he won't be happy about this.
12. ### Inertial mass of a stressed body

Does stress increase the inertia of a body? Does it increase gravitational attraction or in any way affect spacetime curvature? If so, I'm confused, I thought it took energy to do these things.
13. ### Uncertainty laid out

pmb, I believe what you say is true but when I explained this to my friend he told me I was full of it. Would you have cite that explained this?