162 reputation
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bio website http:www.musiikerbeta.appspot…
location Spain
age
visits member for 1 year, 8 months
seen Apr 10 at 8:47

Jan
18
comment Origin of the names for the decay chains
Ra226 has a half life of 1601 years, and an abundance of 100%, and Uranium 238 has a half life of billions of years and abundance of 99.3%... I don't know what can we conclude from this.
Jan
18
asked What are the coefficients of the Geiger-Nutall law dependent on?
Jan
17
asked Origin of the names for the decay chains
Jan
8
accepted Do eigenvectors of quantum operators span the whole Hilbert Space?
Jan
7
comment Do eigenvectors of quantum operators span the whole Hilbert Space?
I was taught that the columns of a diagonalised matrix are its eigenvectors. But now I feel like I'm confused about that.
Jan
7
comment Do eigenvectors of quantum operators span the whole Hilbert Space?
Oh, right, that's the whole problem, I didn't get the right eigenvectors. I just took them to be the coumns of the matrix. Aren't they supposed to be the eigenvectors?
Jan
6
awarded  Commentator
Jan
6
comment Do eigenvectors of quantum operators span the whole Hilbert Space?
Well, the three Lx eigenvectors I get are (0, 0, 0), (1, 1, 1) and (1, -1, 1). How can you compose, say, the vector (0, 0, 1) out of them?
Jan
6
asked Do eigenvectors of quantum operators span the whole Hilbert Space?
Dec
2
accepted General wavefunction and Schrödinger Equation
Dec
2
comment General wavefunction and Schrödinger Equation
Thanks for your answers. I didn't get this, though: " You can think of the first as doing an inner product with a momentum eigenstate in the position basis, and of the latter as doing an inner product with a position eigenstate in the momentum basis." Could you (or anyone else) explain that a little more? An inner product of what? PD: Trimok, may it be that you've written system instead of state?
Dec
2
asked General wavefunction and Schrödinger Equation
Jun
25
asked Why can't we obtain a Hamiltonian by substituting?
Jan
14
comment Entalpy and entropy role in freezing-point depression phenomena
Yeah, I'm more interested in a "physical" explanation, rather than a mathematical one. But thanks, anyway.
Jan
14
accepted Eutectic systems behavior near 100%-0% composition and low temperature
Jan
14
comment Eutectic systems behavior near 100%-0% composition and low temperature
Thanks! That completely answers my question. However, what will happen if we were to lower even more the temperature of the almost-pure sample? According to the diagram it would turn into $\alpha$ + $\beta$, does it mean that the atoms of the low-concentration component would "get closer" until we could see some of them with the naked eye? How could this even happen at an atomic level if the high-concentration element particles have already organized into a solid body?
Jan
14
comment Eutectic systems behavior near 100%-0% composition and low temperature
Suppose we have a number of mixtures of $\alpha$ and $\beta$. If we pick one with a 99% concentration of, say $\alpha$ at a temperature above $\alpha$'s fusion point. When the temperature drops to below the L+$\alpha$ - Solid $\alpha$ equilibrium line, what happens? According to the diagram we have pure solid $\alpha$. Where does the other component go?
Jan
14
revised Eutectic systems behavior near 100%-0% composition and low temperature
edited title
Jan
14
asked Entalpy and entropy role in freezing-point depression phenomena
Jan
14
asked Eutectic systems behavior near 100%-0% composition and low temperature