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Quantum Physics

- Mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics & Field Theory
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Feb23-13 08:38 AM
ZapperZ
1 30,372
Hey, I consider a diagonalized Hamiltonian: H=\sum\limits_{k} \underbrace{ (\epsilon_{k} u_{k}^2 -\epsilon_{k}...
Jan8-14 09:20 AM
DrDu
1 379
Hello, I regard field-operators, whereby \Psi is a fermionic-annihilation-operator and \vec{A(\vec{r})} is an...
Jan17-14 05:47 PM
Avodyne
2 291
Hello, I am thinking for some hours about the commutation of the field-Operator/(annihilation-Operator): \Psi and...
Jan18-14 11:30 PM
Avodyne
3 344
Hey, in my notes I have calculated the Eigenenergie of the Hamiltonian: H= \hbar \omega (n+\frac{1}{2}) \cdot ...
Jan28-14 04:13 PM
Cthugha
4 353
In my note, we have written the field strength tensor as: F^{\mu\nu} =\partial ^\mu A^\nu -\partial ^\nu A^\mu...
Jan28-14 07:10 PM
ChrisVer
5 307
Hi I regard, $$=0$$ but \Psi is a field-operator. I don't understand why the commutation of the derrivative of...
Feb1-14 06:00 PM
WannabeNewton
3 305
Hey Guys, I regard two operators \Psi , \Phi , that don't commute. Does the product-rule, looks like that? ...
Feb6-14 05:34 AM
Bill_K
2 245
Hey guys, I regard a relativistic vector: $$ k^\mu =(k^0,k^1,k^2,k^3,)=(\frac{\omega_k}{c}, \vec{k} ) $$ ...
Feb8-14 02:24 PM
Meir Achuz
2 261
Hi all. Here is an n-particle hamltonian. H=\int...
Jun25-11 10:30 PM
strangerep
9 989
Hi everyone, I have a question concerning the double slit experiment that I would like clarified. According to a...
Sep28-09 08:05 PM
abomination5
1 584
Hi Iam having a little problem understaning why some atoms are configured in a certain way. I know that each...
Apr3-10 10:03 PM
abotiz
3 984
Hi, There is this one thing that bugs me about photoelectric effect, everywhere I read it says usually the K-shell...
Aug31-13 12:03 PM
abotiz
10 893
Hi, Iam having trouble understanding (or actually picturing) things I have learned, now that I look back at it. ...
Aug29-13 03:22 PM
Nugatory
4 445
Suppose, i want to diagonalize operator A by matrix S (A'= S^\\dagger A S). Do i need to form S from "NORMALIZED"...
Sep20-10 10:50 PM
Parlyne
1 741
Hi, I'm doing research to chipproduction, and I can't seem to figure out how transistors really work (in detail)....
May4-05 11:08 AM
abraxas
6 2,868
This question appeared in my exam . Q. A bullet of mass 41g travels at 960m/s. what wavelength can we associate...
Mar20-11 03:06 AM
abrowaqas
2 1,177
Hey guys! First time posting on this site. Been reading for quite a while and really loving it! :thumbs:! I'm a...
Feb12-14 01:09 AM
Khashishi
3 360
Hi guys. I'm trying to get the idea of probability density for 1s hydrogen atom. I just don't understand that...
Feb22-14 10:51 AM
jtbell
3 336
Hey guys. I'm struggling to picture ultraviolet catastrophe. The graph tells me that at certain temperature, intensity...
Apr11-14 05:46 PM
The_Duck
3 402
Hi, I am scratching the surface of information regarding particle physics. I have a basic understanding of standard...
Aug9-12 03:01 PM
JeremyEbert
19 4,122
I've been looking into the time independent schrodinger equation (E\Psi = Ĥ\Psi.) I know that \Psi is the wave...
Jul9-12 07:10 PM
nonequilibrium
1 734
Hi, ΔEΔt ≥\frac{h}{4\pi} How does this formula relate to particle creation? I understand that it is relevant to...
Feb1-13 11:58 AM
The_Duck
2 410
Is Gravity a Force of Attraction? We are familiar with electromagnetic attraction and we understand how and why it...
Dec18-04 05:18 PM
selfAdjoint
1 3,926
In The L=0 states in Hydrogen atom, the electron has a maximum probablity to exist at r=0 ( at the location of the...
May5-06 06:58 AM
koantum
7 1,571
Hello How can a monochromatic light induce a transition ( absorption ) between two energy levels whose energy...
Jun26-06 08:11 AM
inha
3 1,657
Hello I was thinkng of this question and I found it best expressed in a clear manner in another site. I quote the...
Oct15-06 10:40 AM
actionintegral
37 5,201
I have several questions in quantum optics or the quantum theory of radiaition. I begin by the following three...
Nov3-06 03:58 PM
actionintegral
4 2,663
Hi, The energy of the quantum mechanical harmonic oscillator is proved to be quantized after solving the...
Mar19-07 04:37 PM
StatMechGuy
2 1,836
In the famed "quantum eraser" of physics, there is two distinct types, one type which uses an absorptive apparatus for...
Mar11-14 10:16 AM
Cthugha
5 444
Well I'm trying to understand the double-slit experiment (and quantum mechanics), so could you tell me if this is...
May1-12 05:27 PM
ace frehley
2 760
There are few questions on an assignment (taken from an old exam, YIKES!) that are confounding me and I was wondering...
Apr10-13 07:31 PM
ace1719
0 489
I've found many articles online that explain how to solve the Schrodinger equation for a potential dependent on x, but...
Apr15-13 07:29 AM
DrDu
4 777
(disregard my improvised science lingo) so like... a radio wave has a rather macroscopic wavelength. the photon is...
Mar16-14 03:17 AM
jtbell
3 271
Hi- I'm trying to calculate the effect of a magnetic field on some spectral lines. I know that each energy...
Sep14-11 06:38 PM
Acetylene5
1 1,281
Hi! If two particles are entangled, A and B, and someone messes with A, have scientists determined the speed at which...
Aug7-05 11:00 AM
DrChinese
2 935
Hi! This may be a stupid question, but here goes. Is it possible to do a measurement to determine if a photon's...
May18-08 02:14 PM
peter0302
1 1,208
why is there an upper limit to the photon energy that can be observed in the emission spectrum of the hydrogen atom?
Aug8-10 06:59 PM
Eudoxie
2 3,021
The problem statement, all variables and given/known data Debye considered atoms to oscillate from 0 up to a nu...
Apr10-11 09:44 PM
acherentia
3 2,260
Hello everybody, recently in my quantum mechanical course we were introduced to the concept of the quantum harmonic...
Feb10-12 07:21 AM
questionpost
6 1,325
Hello everybody, I was revising for my quantum mechanics course and I was wondering why when we approximate the bond...
Feb25-12 09:13 AM
achilleasatha
0 619

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