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Dec
4
awarded  Caucus
Dec
2
comment Is there any possibility in the future that domestic power consumption could be wholly solar powered?
Well, yearly fluctuations and bad weather, I assume, would cancel out when averaged over an entire year. Unless the location of choice is close to either of the poles, adjusting for latitude isn't as crucial as coming up with a more reasonable figure for the actual collection efficiency.
Dec
2
answered Is there any possibility in the future that domestic power consumption could be wholly solar powered?
Nov
30
accepted Is the momentum operator well-defined in the basis of standing waves?
Nov
30
comment Is the momentum operator well-defined in the basis of standing waves?
Alright, so here's a followup question. I agree that the mode counting operator produces equivalent information. But my problem is that these states do no distinguish between positive and negative momenta (they don't specify a sign). So, if I were to put wave packet in the box with some momentum, moving along, say, the positive $x$ axis, how would such a packet be decomposed in the basis of the eigenstates? And how would it differ if the initial momentum had been negative?
Nov
30
comment Is the momentum operator well-defined in the basis of standing waves?
I'm doing this indeed for numerical purposes. So technically speaking, since the matrix elements of $\hat{p}$ vanish when the difference between $m$ and $n$ increases, would taking a larger finite matrix result in the off-diagonal elements of $\hat{p}^2$ getting smaller?
Nov
30
comment Is the momentum operator well-defined in the basis of standing waves?
Shouldn't the momentum operator exist anyway, and any invariance of the Hamiltonian just imply that it (meaning its expected value) is conserved?
Nov
30
asked Is the momentum operator well-defined in the basis of standing waves?
Nov
28
comment How was the Oh-My-God particle observed?
But how traceable are these jets, especially if a major portion of the particles produced do not reach any detector? (Also, what does PMT stand for?)
Nov
28
asked How was the Oh-My-God particle observed?
Nov
23
awarded  Editor
Nov
23
revised Energy Question
added 81 characters in body
Nov
23
comment Energy Question
@dbaseman When the atoms decay, they don't vanish into thin air. Your expression for mass vanishes for t tending to infinity, which is wrong, since we still have a considerable mass of the ball as "radioactive waste". See my answer below.
Nov
23
answered Energy Question
Nov
18
accepted Dipole moment of the electron
Nov
18
asked Dipole moment of the electron
Nov
12
asked Practical meaning of making a measurement/observation in QM?
Nov
8
asked Most sophisticated experiment you could perform in your garage?
Oct
31
comment Cause of buoyant force?
@leonardo - if you'd like a more rigorous proof, you can easily show that this is a consequence of the divergence theorem (Gauss's law).
Oct
20
comment How does one calculate the volume of a nucleus and the volume of an atom (in this case hydrogen)?
Do you mean, how do you find the volume from the given radii, or how these radii are obtained? The former is straightforward (see answer below), the latter is a bit more complicated.