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

Feb2313 08:38 AM
ZapperZ

1 
34,132 
Hello everybody,
I was revising for my quantum mechanics course and I was wondering why when we approximate the bond...

Feb2512 09:13 AM
achilleasatha

0 
644 
when a photon goes through a polarizer, its spin becomes determinate
how does it become indeterminate later?
...

Feb2512 09:14 AM
San K

0 
557 
Hi i am student from India who has completed his Bsc degree and have applied to few Universities in Europe for Msc in...

Feb2512 11:04 AM
quantumboy

0 
1,813 
Greetings chaps,
This will probably be old hat to most of you, but I'm beginning to start Quantum mech. so that I...

Feb2512 11:32 AM
ibazulic

7 
964 
Hello all, I am having trouble understanding how this works. In Krane there arises a discussion on total angular...

Feb2512 12:23 PM
Bill_K

1 
1,295 
Light consist of photons but also has a wave nature which consists of electric and magnetic waves right?
So when...

Feb2512 12:29 PM
juanrga

2 
1,411 
anybody?

Feb2512 02:09 PM
Mr_Physicist

7 
1,053 
Is it possible to acheive commercially viable nuclear fusion in purely electrostatic quantum tunneling way?What should...

Feb2512 02:11 PM
cmb

2 
1,443 
How close do two room temperature deuterium nuclei need to be to each other to have a oneinaquintillion chance of...

Feb2512 02:20 PM
cmb

19 
4,142 
Since every fundamental particle in the Standard Model should have it's anticounterpart?
Also, after the LHC has...

Feb2512 02:42 PM
Michio Cuckoo

5 
1,370 
Do the wave functions for smaller objects disperse faster?
How long does a macroscopic wave function (for example...

Feb2512 05:30 PM
jtbell

1 
803 
Note the wave function in the Schroedinger Equation has phase freedom from 0 to 360 degrees.
Imagine the Mexican...

Feb2612 07:02 AM
waterfall

0 
598 
hello there,
i've read in several places the following: if you have a polyene with J double bonds, and taking into...

Feb2612 07:04 AM
sweet springs

5 
1,357 
I was doing a question while back about finding the de Broglie wavelength of a bullet with a given mass travelling at...

Feb2612 07:29 AM
ZealScience

3 
792 
Is it the same as the total angular momentum quantum number ?????

Feb2612 08:45 AM
Chemist20

2 
1,595 
hi
my question is simple: is there empty space with null energy?
thx.

Feb2612 09:41 AM
avery

2 
834 
Hi
Say I want to describe the interaction between a free atom atom and a classical EM field. The full Hamiltonian...

Feb2612 01:52 PM
Niles

3 
830 
Do you consider "photon" as belonging to classical physics or nonclassical physics? When Einstein discovered the...

Feb2612 03:18 PM
Jano L.

5 
1,177 
We know from classical mechanics that angular momentum L = r \times p depends on your choice of origin. My question...

Feb2612 04:29 PM
widderjoos

3 
1,220 
I think I'm trying to reconcile quantum mechanics and special relativity . . . or whatever I'm doing I'm pretty...

Feb2612 09:09 PM
fhqwgads2005

5 
1,427 
From what I've gathered reading the scientific literature, the more precise we know a quantum system's position, the...

Feb2612 10:58 PM
AdrianMay

9 
1,140 
Two questions regarding decoherence
1) preferred pointer basis:
Decoherence explains why a quantum object...

Feb2712 06:51 AM
A. Neumaier

14 
1,918 
Hello,
I can understand only the basic principle behind quantum entanglement. Do you guys know of the mechanism by...

Feb2712 08:52 AM
DrChinese

3 
1,297 
Hi,
I know very little about quantum physics so I need some help here, but recently I have seen lots of new agers...

Feb2712 09:17 AM
BWV

12 
2,175 
Below are 2 states in the gluon octet.
What is the difference between:
...

Feb2712 01:09 PM
Ben Niehoff

1 
850 
Hi everybody! I'm studying this paper "Unambiguous discrimination among quantum operations"...

Feb2712 03:47 PM
provolus

0 
934 
Last night I started reading the section of Brian Cox's "The Quantum Universe" where they discuss how to calculate the...

Feb2712 09:23 PM
StevieTNZ

29 
3,183 
Hello,
I was solving the time dependent schrodinger equation in a timeindependent potential such that E<V and I...

Feb2812 12:13 AM
zhermes

1 
814 
Hi,
After some (limited) reading I've written an article on the captioned subject :
...

Feb2812 12:46 AM
sytstp

5 
1,811 
Hello there,
I was reading an article on wiki about the Breit equation:
...

Feb2812 04:50 AM
juanrga

3 
1,574 
Suppose a K.G. field. When I apply the creation operator on the vacuum, how do I know it is a pion or any other boson?

Feb2812 12:04 PM
intervoxel

3 
979 
There are tons of interpretations of quantum mechanics, but I'm unaware of any that are 'classical' as in being local,...

Feb2812 01:41 PM
Xilor

24 
2,065 
Greetings everyone,
I haven’t done any quantum in a while, and was reviewing my textbook, Griffiths Ed. 1. The form...

Feb2812 04:11 PM
HJ Farnsworth

5 
1,294 
When electrons jump from one shell to another energy has to be released right? Why is only light energy released? Why...

Feb2812 08:52 PM
questionpost

7 
1,490 
I am reading about dense coding, and I can't understand which qubit does Alice send to Bob. Her qubit or the shared...

Feb2912 02:54 AM
calculemus198

0 
631 
the nature of mass at rest is different from that in motion due to dual nature,therefore. the brains of the astronauts...

Feb2912 06:44 AM
ZealScience

3 
732 
Is Quantum entanglement really true ?, they say that that have observed it with photons and the distance between the...

Feb2912 08:44 AM
DrChinese

3 
981 
I'm really getting frustrated right now, as I am unable to reproduce the twopoint gaugefield correlation function...

Feb2912 09:30 AM
Lapidus

10 
1,730 
If I may, I would like to give this question another try, especially if guys with some cabala in QFT can address it.
...

Feb2912 10:15 AM
A. Neumaier

41 
3,534 
I would like to perturb the wavefunction of a localized charged particle with a potential that is close to a delta...

Feb2912 02:48 PM
Spinnor

4 
1,076 