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Feb2313 08:38 AM
ZapperZ

1 
30,452 
Hi guys,
is there a reason why the energy of the harmonic oscillator is always written as:$$
E_{n} = \hbar \omega...

Apr1913 02:38 PM
dextercioby

1 
435 
Hey,
I consider a diagonalized Hamiltonian:
H=\sum\limits_{k} \underbrace{ (\epsilon_{k} u_{k}^2 \epsilon_{k}...

Jan814 09:20 AM
DrDu

1 
384 
Hello,
I regard fieldoperators, whereby \Psi is a fermionicannihilationoperator and
\vec{A(\vec{r})} is an...

Jan1714 05:47 PM
Avodyne

2 
295 
Hello,
I am thinking for some hours about the commutation of the fieldOperator/(annihilationOperator): \Psi and...

Jan1814 11:30 PM
Avodyne

3 
350 
Hey,
in my notes I have calculated the Eigenenergie of the Hamiltonian:
H= \hbar \omega (n+\frac{1}{2}) \cdot
...

Jan2814 04:13 PM
Cthugha

4 
356 
In my note,
we have written the field strength tensor as:
F^{\mu\nu} =\partial ^\mu A^\nu \partial ^\nu A^\mu...

Jan2814 07:10 PM
ChrisVer

5 
308 
Hi I regard,
$$=0$$
but \Psi is a fieldoperator.
I don't understand why the commutation of the derrivative of...

Feb114 06:00 PM
WannabeNewton

3 
309 
Hey Guys,
I regard two operators \Psi , \Phi , that don't commute.
Does the productrule, looks like that?
...

Feb614 05:34 AM
Bill_K

2 
250 
Hey guys,
I regard a relativistic vector:
$$
k^\mu =(k^0,k^1,k^2,k^3,)=(\frac{\omega_k}{c}, \vec{k} )
$$
...

Feb814 02:24 PM
Meir Achuz

2 
263 
Hi all. Here is an nparticle hamltonian.
H=\int...

Jun2511 10:30 PM
strangerep

9 
991 
Hi everyone,
I have a question concerning the double slit experiment that I would like clarified. According to a...

Sep2809 08:05 PM
abomination5

1 
588 
Hi
Iam having a little problem understaning why some atoms are configured in a certain way.
I know that each...

Apr310 10:03 PM
abotiz

3 
985 
Hi,
There is this one thing that bugs me about photoelectric effect, everywhere I read it says usually the Kshell...

Aug3113 12:03 PM
abotiz

10 
898 
Hi,
Iam having trouble understanding (or actually picturing) things I have learned, now that I look back at it.
...

Aug2913 03:22 PM
Nugatory

4 
448 
Suppose, i want to diagonalize operator A by matrix S (A'= S^\\dagger A S). Do i need to form S from "NORMALIZED"...

Sep2010 10:50 PM
Parlyne

1 
744 
Hi,
I'm doing research to chipproduction, and I can't seem to figure out how transistors really work (in detail)....

May405 11:08 AM
abraxas

6 
2,877 
This question appeared in my exam .
Q. A bullet of mass 41g travels at 960m/s. what wavelength can we associate...

Mar2011 03:06 AM
abrowaqas

2 
1,184 
Hey guys! First time posting on this site. Been reading for quite a while and really loving it! :thumbs:!
I'm a...

Feb1214 01:09 AM
Khashishi

3 
365 
Hi guys. I'm trying to get the idea of probability density for 1s hydrogen atom.
I just don't understand that...

Feb2214 10:51 AM
jtbell

3 
344 
Hey guys. I'm struggling to picture ultraviolet catastrophe. The graph tells me that at certain temperature, intensity...

Apr1114 05:46 PM
The_Duck

3 
429 
Hi,
I am scratching the surface of information regarding particle physics. I have a basic understanding of standard...

Aug912 03:01 PM
JeremyEbert

19 
4,143 
I've been looking into the time independent schrodinger equation (E\Psi = Ĥ\Psi.)
I know that \Psi is the wave...

Jul912 07:10 PM
nonequilibrium

1 
737 
Hi,
ΔEΔt ≥\frac{h}{4\pi}
How does this formula relate to particle creation? I understand that it is relevant to...

Feb113 11:58 AM
The_Duck

2 
411 
Is Gravity a Force of Attraction?
We are familiar with electromagnetic attraction and we understand how and why it...

Dec1804 05:18 PM
selfAdjoint

1 
3,928 
In The L=0 states in Hydrogen atom, the electron has a maximum probablity to exist at r=0 ( at the location of the...

May506 06:58 AM
koantum

7 
1,573 
Hello
How can a monochromatic light induce a transition ( absorption ) between two energy levels whose energy...

Jun2606 08:11 AM
inha

3 
1,659 
Hello
I was thinkng of this question and I found it best expressed in a clear manner in another site. I quote the...

Oct1506 10:40 AM
actionintegral

37 
5,203 
I have several questions in quantum optics or the quantum theory of radiaition. I begin by the following three...

Nov306 03:58 PM
actionintegral

4 
2,667 
Hi,
The energy of the quantum mechanical harmonic oscillator is proved to
be quantized after solving the...

Mar1907 04:37 PM
StatMechGuy

2 
1,840 
In the famed "quantum eraser" of physics, there is two distinct types, one type which uses an absorptive apparatus for...

Mar1114 10:16 AM
Cthugha

5 
448 
Well I'm trying to understand the doubleslit experiment (and quantum mechanics), so could you tell me if this is...

May112 05:27 PM
ace frehley

2 
761 
There are few questions on an assignment (taken from an old exam, YIKES!) that are confounding me and I was wondering...

Apr1013 07:31 PM
ace1719

0 
492 
I've found many articles online that explain how to solve the Schrodinger equation for a potential dependent on x, but...

Apr1513 07:29 AM
DrDu

4 
788 
(disregard my improvised science lingo)
so like... a radio wave has a rather macroscopic wavelength. the photon is...

Mar1614 03:17 AM
jtbell

3 
273 
Hi
I'm trying to calculate the effect of a magnetic field on some spectral lines. I know that each energy...

Sep1411 06:38 PM
Acetylene5

1 
1,284 
Hi! If two particles are entangled, A and B, and someone messes with A, have scientists determined the speed at which...

Aug705 11:00 AM
DrChinese

2 
938 
Hi! This may be a stupid question, but here goes.
Is it possible to do a measurement to determine if a photon's...

May1808 02:14 PM
peter0302

1 
1,211 
why is there an upper limit to the photon energy that can be observed in the emission spectrum of the hydrogen atom?

Aug810 06:59 PM
Eudoxie

2 
3,048 
The problem statement, all variables and given/known data
Debye considered atoms to oscillate from 0 up to a nu...

Apr1011 09:44 PM
acherentia

3 
2,262 
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 
620 