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age 23
visits member for 1 year, 7 months
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NTS


Jul
8
comment Light dispersion in water
So if I incide light not normally in a big amount of water, will I see dispersion? Shouldn't then I see dispersion by looking at the sun (when it's NOT on top of the sky) from behind the water, for example in the sea?
Jun
16
comment Decomposition of this wave function in eigenfunctions
Thank you for your help. That's what I initially thought, but he made some reasoning before calculating, and doing that in the case when the highest value for $\ell$ is, let's say, $10$, doesn't seem very efficient.
Jun
16
comment Decomposition of this wave function in eigenfunctions
Thank you very much. I give you the correct answer for completeness.
Jun
13
comment Calculation of magnetic force magnitude from a parmenant magnet
What's vertical pull? What units do they give you for that? Can you link the website?
Jun
12
comment Effect of slits and a lens
Ok, thank you, that: $x=f\sin \theta$ was what I needed, I was using $x$ as a generic variable, meaning angular coordinates: $\mathrm{sinc} ^2(kpd/2)$. Thanks for your help.
Jun
12
comment Effect of slits and a lens
Thank you for your answer, specially the third case. So, the lens still compresses the difraction pattern of the $\sin^2 x/x^2$, doesn't it? i understand they're centered at the same point, but is there a way to calculate quantitatively the position of the fringes in the focal plane of the lens?
Jun
10
comment Dynamic equation
Ok, thank you for your complete answer, you explained it perfectly
May
22
comment Frank Hertz experiment and different jumps
Thank you for the answer and the article. I'm going to read it.
May
5
comment Historic derivation of Wien's law
@LeosOndra Thank you very much for you help and your time
May
5
comment Historic derivation of Wien's law
@LeosOndra I would appreciate it, I don't spek any russian though. I'm not interested in the whole article, only in the derivation of that law.
Apr
26
comment Quantum commutator
ok, thanks you very much
Apr
5
comment Why does the index of refraction change the direction of light
Thank you very much, that analogy ir really good.
Apr
4
comment Why does the index of refraction change the direction of light
Thanks I got it. that picture opened my eyes (even when I have seen that picture like a trillion times)
Apr
4
comment Why does the index of refraction change the direction of light
@Gugg Isn't it the same? I guess that when studying the refraction of a single-wavelenght wave, you will get that the angle depends on the frequency, and there fore the multiwavelength light is dispersed.
Apr
4
comment Is there a compound denser than the densest element?
BTW, how could find prices for things like Californium, Berkelium or Curium?
Mar
29
comment cgs Gauss' system of units
@ChrisWhite Neither did I, my teacher uses it for dipole and he writes it like that in his notes (they're computer written so it's not bad calligraphy). All optics book I've seen use just $p$.
Mar
29
comment cgs Gauss' system of units
@LuboŇ°Motl Thanks, that's both relieving and it sucks. I will try to get used to cgs Gauss' system as I am seeing it is actually used.
Mar
29
comment cgs Gauss' system of units
@MarkEichenlaub Ok, generally, I understand where both systems come from, but I still have not clear how to change between systems. The only thing I could do is to go to the beginning and start deriving in both systems to see the differences.
Mar
25
comment Why is $\vec j\cdot \vec e$ the joule dissipation?
And so what is its physical interpretation microscopically. What's that product at those scales, how must I see that?
Mar
19
comment Monochromatic wave
Ok, thank you for the answer.