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Quantum Physics

- Mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics & Field Theory
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:38 AM
ZapperZ
1 34,589
How did someone came up with the idea that , an outcome doesn't exist until we really observer it? How did that...
Jul3-12 10:11 AM
al onestone
25 1,729
what is the difference between first- and second-type bessel functions?
Jul3-12 08:48 AM
Simon Bridge
1 424
when a wave-function splits into two paths (such as in a double slit or a mach-zehnder) how does the Schrodinger...
Jul3-12 07:06 AM
Simon Bridge
10 1,130
Had some questions about wave-functions. Some of the questions might be invalid due to limited knowledge of the OP. ...
Jul3-12 07:04 AM
Simon Bridge
21 2,557
In single particle interference experiments: what, besides probability amplitude, splits at the slits? don't...
Jul3-12 06:53 AM
Demystifier
2 684
wave-function is a probability amplitude in quantum mechanics describing the quantum state of a particle and how it...
Jul3-12 06:27 AM
Simon Bridge
1 482
Hi everybody, I apologize for my trivial question, I'm reading a paper by Freedman and Kitaev and, when describing...
Jul3-12 02:43 AM
gioialorusso
2 1,833
1) What is mean by fermion with half integer spin and boson with integer spin Is that fermion, 1/2,3/2... boson,...
Jul3-12 01:19 AM
Einj
4 906
Quantum laser diodes. How does light escape? I recently became very interested on the functioning of these amazing...
Jul2-12 10:18 PM
manueldois
3 1,802
hello i have question : how the superposition principle proves continuity of ψ in potential barrier
Jul2-12 08:18 PM
Naty1
5 630
Hi, I've been reading a QM book and it mentions that particles can be represented as a wave packet, which provides...
Jul2-12 04:24 PM
Nugatory
3 554
Is there some way to approximate the density of entangled particles in space?
Jul2-12 12:32 PM
mt3209
0 245
Hi I would like to know if I have a system of coupled harmonic oscillators whether the standard position operator...
Jul2-12 07:42 AM
mtak0114
0 403
For the photoelectric effect, when light hits a metal, and the frequency is above the work function, electrons are...
Jul2-12 03:48 AM
M Quack
2 526
It is said that the solutions of the Klein-Gordon equation cannot be interpreted as probability densities since the...
Jul2-12 02:38 AM
Demystifier
2 496
I'm looking for the BEST and most COMPLETE book describing - The quantum mechanics of the hydrogen atom (working...
Jul1-12 05:03 PM
Bill_K
2 609
I am having hard times, trying to find out how the FermiDirac and BoseEinstein distributions give you at a limit the...
Jul1-12 02:19 PM
Bill_K
1 422
When a photon has a wavelength close to the energy needed for an electron jump in an atom, the atom will absorb the...
Jul1-12 01:08 PM
Hells
2 638
Does Pauli's exclusion principle apply to superposition or only collapsed states? I.e. could a particle be...
Jul1-12 11:58 AM
Mukilab
7 774
A particle in the ground state of a potential well can only gain energy by making a transition to one of the higher...
Jul1-12 07:39 AM
tom.stoer
5 883
Can someone please elaborate these lines: "Causality applies only to a system which is left undisturbed. If a...
Jul1-12 12:52 AM
San K
13 2,697
What is the difference between eigenfunction and wave function? I'm always get confused when i am asked to write...
Jul1-12 12:38 AM
Simon Bridge
4 1,022
Almost everyone is familiar with the sentence "accelerated charges radiate em waves". Nevertheless, if you are...
Jun30-12 08:56 PM
Dickfore
6 1,007
Alright. So the Dirac Eq is (i \gamma^{\mu} \partial_{\mu} - m) \psi = 0 or putting the time part on one side...
Jun30-12 06:56 PM
geoduck
7 1,389
I have just watched a video by Professor Brian Cox. In it he describes the proposed Higgs field. If it exists, it is...
Jun30-12 05:20 PM
Nabeshin
3 749
If the Higgs field is responsible for embuing particles with mass, and mass is responsible for gravity, is it possible...
Jun30-12 04:13 PM
Parlyne
2 938
I am aware that n is the principal quantum number and determines the energy of a specific energy level of an atom. In...
Jun30-12 03:20 PM
Einstein Mcfly
4 1,737
Do free particles have quantum numbers? What are they?
Jun30-12 12:12 PM
xz5x
2 559
Hi all! I'm sorry if this question has been already asked in another post... I'm studying the path integrals...
Jun30-12 05:02 AM
Einj
2 950
Hi, i can't get the result stated as equation (2.33) in page 22. To be more clear, after the elimination of the...
Jun30-12 02:41 AM
dazhuzai8
1 772
Hi physicists, How can two atomic-scale particles interact through gravitation (Gm1m2/r^2) or any other force that...
Jun30-12 12:00 AM
Simon Bridge
4 888
Hi, could anyone try to explain one thing about the Heisenberg Uncertainty Principle I don't understand? The...
Jun29-12 02:45 PM
Muphrid
10 1,252
In the double-slit experiment, without which-path information available, the diffraction pattern is usually shown as...
Jun29-12 01:00 PM
cygnet1
2 700
What are the differences between the probability density function and the radial probability density functions (in...
Jun29-12 09:16 AM
CAF123
0 621
I'm wondering because the gamma ray photon is smaller yet it has a higher frequency. Is it because the amount of...
Jun29-12 07:23 AM
Naty1
17 8,848
A quantum particle can tunnel through a barrier and we can describe why this is so by the uncertainty principle....
Jun29-12 05:31 AM
ZapperZ
5 814
Hello dear readers, I have a problem. I'm giving a lecture tomorrow on the EPR experiment and Bell's theorem and so...
Jun29-12 05:29 AM
Tomer
13 1,360
Hello, I'm trying to solve a time independent schrodinger equation with matlab. i wish to write a function whose...
Jun29-12 03:14 AM
farzin22
0 1,964
What do you think the word "photon" used in textbooks and papers at present mean? - extended object which, when...
Jun28-12 07:35 PM
D H
19 1,368
what we mean by uncertainty in energy in quantum tunneling ? it's hard to understand uncertainty principle
Jun28-12 03:55 PM
sciboudy
0 449

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