
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:38 AM
ZapperZ

1 
36,455 
This is not a homework problem, I hope im in the right forum.
Suppose a magnetic field is applied long enough so...

Oct1007 10:31 PM
di1026

7 
1,596 
Would a water wave leak just like an electron with a barrier?

Sep2812 01:27 AM
haael

5 
1,160 
Ok so I'm currently revising my quantum theory course from this year and I've reached the section on the postulates...

Mar2013 09:06 AM
QuantumMoose

4 
686 
If the answer is no, why?
Is it possible to show that, given the state spaces we have for individual particles,...

Oct608 04:18 AM
vanesch

1 
1,546 
Heisenberg's uncertainty principle asserts a fundamental limit to the precision with which certain pairs of physical...

Feb2213 04:56 PM
Mordred

23 
1,514 
What is Quantum Entanglement, and what does it do?
I attempted at learning via online articles.

Aug1214 03:29 PM
BiGyElLoWhAt

17 
469 
Why is Schrodinger's Cat entangled? Or is it not? I recently saw a poster on deviantart that said this:...

Feb2813 12:29 AM
QuantumPixel

3 
551 
Can somebody explain to me exactly what Virtual Particles are (Like the Higgs Boson) and their respective virtual...

Apr313 05:32 AM
vanhees71

3 
734 
Can someone please help me out with mass terms in the general case for a lagrangian?
It is known that for n scalar...

Feb210 10:33 PM
QuantumSkippy

0 
1,968 
Why is a solid state laser diode pen which emits eletromagnetic radiation in the form of a constant range of...

Feb605 10:07 AM
dextercioby

6 
993 
How you learn quantum physics I don't know. The math is complicated. I want to know a really hard equation that...

May1205 09:52 AM
ArielGenesis

15 
2,282 
I was reading John Cramers column and came across the AAVP Effect. See references below. Basically, if you have...

Jan2906 04:40 AM
QuantumUnbound

0 
901 
If I set up an interference experiment and make one path much longer than the other would I still see an interference...

Feb906 05:53 AM
vanesch

1 
1,253 
I was reading some some popular science rags and came across an article that espoused:
But I didn't think all...

Feb1206 04:07 PM
QuantumUnbound

0 
2,491 
I'm working on a research paper on Quantum Entanglement and came across something I don't understand. (I assume this...

Dec1709 11:21 PM
QuantumVegan

8 
2,004 
http://imageshack.us/photo/myimages/40/63636538.png/

Feb1413 02:39 AM
QuantumWild

0 
374 
Before I make my post, I'd just like to introduce myself. My nickname is quantum_foam, as you can see (it's from the...

Nov803 11:35 PM
quantum_foam

4 
1,248 
In F. Wilczeks book, The Lightness of Being he describes his theory on the origin of mass. He explains, in much more...

Jan1009 01:56 PM
malawi_glenn

2 
811 
OK, I have a problem with the manyworld interpretation, namely the quantum suicide experiment. My problem: How...

Jun2806 11:32 PM
koantum

58 
7,991 
Imagine you have two plates which can either be perfectly conducting or perfectly insulating by changing some...

Nov506 07:34 PM
Epicurus

8 
1,919 
I am reading chapter three of Huang's Statistical Mechanics and I have a problem with equation (3.22). Having...

May1912 08:03 AM
QuArK21343

2 
591 
I am told that when an atom absorbs a photon, it jumps up an energy level, these are discrete levels of energy etc...

Apr711 07:41 PM
Einstein Mcfly

3 
866 
Hi, I have a ground state wavefunction, $$ \psi_0(\xi) = A_0\exp(\frac{1}{2}\alpha\xi^2), $$ (##\alpha## is a...

Dec1313 07:45 AM
quarkgazer

0 
387 
Since it appears (so far) I am infringing no rule, here is another shameless copy/paste of a thread I started on...

Oct2408 06:19 PM
Haelfix

1 
1,177 
Hi
In double slit experiment our observe can change the past and in the entanglement our observe affact other...

Dec1313 09:44 AM
Quarlep

10 
756 
Spin is a quantity of vector but I dont know how to add them ? Please be simple
Thanks

Aug1414 09:19 AM
Quarlep

2 
166 
I watched a video about particle physics and there I saw something strange(for me)...

Aug1814 02:18 AM
MrRobotoToo

6 
372 
Hi I am curios about something we know E2=(mc2)2+(pc)2 than Paul Dirac maid E2=(mc2)2 than we know he find antimatter ...

Aug2914 01:41 PM
Drakkith

3 
135 
In particle physics we know that total angular momentum is conserved and its equal to orbital angular momentum plus...

Aug3014 09:32 AM
Quarlep

2 
228 
Why is there no kinetic energy term in said hamiltonian? Suppose I take a magnetic dipole in my hand, and I throw it...

Dec2405 11:17 AM
abszero

3 
6,290 
I've always wondered what is considered to be 1 photon. We always see things like "When two of these particle collide,...

Nov2708 09:46 PM
enotstrebor

34 
10,895 
I am reading the first chapter of Sakurai's Modern QM and from pages 30 and 32 respectively, I understand that
(i)...

Aug1106 03:21 AM
dextercioby

5 
1,474 
The SE is written in terms of a potential energy. It says, "given a particle in a region where the potential is...

Oct406 08:29 PM
Galileo

4 
1,955 
How should \Delta E \Delta t \geq \hbar/2 be interpreted? When does it apply? Delta t refers to the time of what? etc....

May712 06:40 AM
Demystifier

10 
8,326 
In Reif's thermo book, one can read
"Consider a substance which contains n magnetics atoms per unit volumes and...

Nov1306 10:57 AM
quasar987

5 
5,095 
In my thermo text, they consider a diatomic molecule that is rotating about the axis joining the two atoms (also the...

Nov1406 09:42 PM
quasar987

5 
2,291 
Hi,
I have a problem with the very nature of time dependant perturbation theory (TDPT). In TDPT, we consider a...

Mar1607 02:23 PM
vanesch

3 
1,496 
Hi,
Is there an explicit formula for the eigenfunctions of the harmonic oscillator? By explicit, I mean "not...

Mar2707 03:30 AM
christianjb

8 
4,078 
As I understand (from reading p. 206 of Marle's 1975 text on geometric quantization available on the french wiki page...

Mar2512 09:37 AM
fzero

9 
1,412 
I have been reading about some quantum gravity topics, and am wondering: how many different modifications to the...

Nov708 03:09 AM
Haelfix

3 
1,163 