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Jul24-14 11:39 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
May6-14 04:32 AM
Cthugha
168 186,666
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 69,524
1. EM wave can be reflected by metal surface only. Right? 2. SONAR can be reflected by any materials. Right? 3....
Jan6-05 11:30 AM
russ_watters
8 1,044
Recall carefully the best physics idea you've seen posted on Physics Forums - one that might be worthy of publication...
May31-04 07:53 PM
Loren Booda
0 1,086
There doesn't seem to be any difference between n = (1-\delta) - i\beta (the refractive index in the x-ray regime,...
Aug21-08 10:06 PM
DivGradCurl
0 3,801
Hello, I've the pleasure to announce that my PHD thesis is now online at the following url:...
Oct11-06 02:43 PM
Cl.Massé
0 656
The Study of Cycles Edward R Dewey formed the Foundation for the Study of Cycles in 1941 as a result of studies he...
Oct12-06 04:54 AM
Cycles Research Institute
0 946
Hi everybody! Just 2 important notes: I don't study physics and so I'm not sure if this question belongs here (but...
Sep21-13 11:22 AM
Claude Bile
5 783
Folks, I'm reading the 3rd edition of Thin Film Optical Filters by Macleod, and I've derived his expression for...
Apr14-08 10:52 PM
DivGradCurl
1 1,899
Hi friends, although I guess most of us are getting too old for the school, here is the link to the Ph.D....
Mar1-06 06:00 AM
Gabriele Honecker
0 1,162
Hi friends, although I guess most of us are getting too old for the school, here is the link to the Ph.D....
Nov4-06 03:27 PM
Gabriele Honecker
0 1,135
Dear spr£Ĵ ĦĦĦĦĦĦĦĦĦĦĦĦĦĦĦĦ Best Regards, ĦĦĦĦĦĦĦĦĦĦĦĦĦĦĦĦLixin Xu
Nov4-06 03:18 PM
Lixin Xu
0 1,943
Hello, For simplicity's sake, let's take a np junction. Say we connect the left side (n-pole) to a POSITIVE...
Dec28-10 09:52 AM
nonequilibrium
2 3,800
The original post was worded in such a horrid way, probably no one understood what I was asking, I am retyping the...
May31-14 05:01 PM
ugenetic
0 233
Hi all, I'm confused about the concept of wavefronts in ray tracing .. each ray is considered a wavefront? or what...
Jun26-09 03:55 AM
whitenight541
3 1,043
Hi, It is long time to come here sine i graduate University. Anyway, My question is whether exact form of Group...
Mar23-09 11:33 PM
jtbell
1 2,155
Hi, I learned optics with pedrotti optics book. It is suppopsed that light is reflected on surface of first layer...
Apr3-09 05:38 AM
Doc Al
1 1,338
Hi, I studied concept of numerical aperture and f number I learned numerical aperture(N.A) is measure of how much...
Apr7-09 06:23 PM
Andy Resnick
1 1,935
If a bird is in the air and for whatever reason it stops flapping it's wing, it'll fall back down. Is there a lag time...
Apr6-08 06:12 AM
clouded.perception
15 1,385
Hi i just learned fluide eqation form chen textbok The equation is mn\left=qn(E+u\times B)-\nabla\cdot P -...
Feb8-12 11:57 PM
Basu Dev
6 2,124
so here is the problem The block in the figure below lies on a horizontal frictionless surface and is attached to...
Dec10-10 04:56 AM
Doc Al
2 5,197
I am looking for other opinions on the following that has come to my attention: Seongtaek Seo (2013) Orthogonal...
Dec17-13 09:51 PM
DaleSpam
5 837
Why can't our eyes focus on that one type of deep blue Christmas lights? It always appears fuzzy from a distance,...
Jan9-11 10:30 PM
Oldfart
11 3,624
I had an interesting idea for increasing the Specific Impulse and Thrust of a nuclear rocket engine; it's probably not...
Oct12-13 04:20 PM
FireStorm000
5 832
This came out of a philosophical discussion last night. It is probably stupid from a physicist's point of view, so...
Jul19-06 04:00 AM
C. Tellermann
3 1,112
This came out of a philosophical discussion last night. It is probably stupid from a physicist's point of view, so...
Nov4-06 03:37 PM
C. Tellermann
3 1,575
I'm recently looking for optical devices to do some experiments at home, like diffraction and polarization, but when I...
Nov5-12 08:37 PM
Simon Bridge
5 1,169
Hi all, I am trying to understand about collision frequency that happened in ionosphere layer. In D region, below...
Jan29-14 01:33 AM
s_hy
0 254
I am looking to prove the relation I=(1/4)cE Where I is the radiation emittance which is the energy emitted by a...
Jul4-09 03:41 AM
sharomi
0 1,355
whatis the relationship between general and special relativity? i know the general idea,but i don't understand how...
Nov7-03 03:40 PM
pmb
25 1,910
Hi all, I recently encountered this scenario. I placed a (1 litre) glass bottle with water (about half filled)...
Nov4-11 06:38 PM
dibilo
3 1,211
in my lab there is a SL-III laser i want to ask something in manual,in optical troubleshooting part (oscillator...
Jan23-13 01:07 PM
virgoagasi
0 539
Hi there. What happens during the electron -ion collision when the velocity of ion is higher than that of electrons?...
May25-11 12:41 AM
Drakkith
6 1,511
It is said that the stress tensor \mathbf T for a fluid at rest is diagonal. Why is this? The fact that the fluid...
Jul14-12 07:45 PM
AlephZero
15 2,129
1. Is the charge density (No. of charges/volume) constant for a specific material ? e.g. Copper has a constant charge...
May27-12 07:40 AM
ZapperZ
1 1,904
Hi Can someone please explain the answer to the following thread? I tried uncoupling the Hamiltonian but to no avail....
Dec5-12 07:28 AM
mfb
3 627
Hello, I know this question may be absurd or very basic, but I need to know what it means when two variables with...
Apr1-13 11:28 PM
A.T.
4 682
http://upload.wikimedia.org/wikipedia/commons/thumb/c/c6/Drag_sphere_nasa.svg/673px-Drag_sphere_nasa.svg.png As you...
Nov19-13 08:31 PM
rcgldr
1 390
I know that in an ac current circuit the direction of current will reverse at a given frequency. But why it will make...
May28-12 09:02 AM
Deathnote777
0 823
HI all, I did wrote codes for 2D FDTD TFSF TMZ mode using yee algorithm. But the output I got was not as expected....
Jun7-13 12:00 PM
s_hy
0 556
Hey folks, I just wonder how you guys think about this. Assume that there is a spring pendulum rotating at hinge...
Dec18-11 03:30 AM
Simon Bridge
1 1,537
Good morning/ evening... How r u guys and ladies..? I have room with 4*5 meters and 3 meters in hight.. I...
Mar6-10 05:42 PM
Conanooo
2 852

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