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May25-09 10:31 AM ZapperZ 

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General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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Apr22-11 05:27 AM
ZapperZ
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The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
Apr8-14 10:13 AM
ZapperZ
166 160,384
My 8th grade students are doing a comparison of ionic and covalent compounds, comparing their electrical conductivity....
Dec7-07 01:13 PM
Sojourner01
11 3,503
I am seeking distance-learning (i.e., Web-based) distance learning programs in physics, in pursuit of an M.A. or...
Nov2-08 06:10 PM
greensmith
3 5,634
I know that light is electromagnetic radiation that behaves as a wave and as a photon and that it can travel through a...
Apr28-10 06:57 PM
JDługosz
6 1,515
I have a question which may be based in a complete misunderstanding of how "color" and our perception of it works in...
Sep20-09 05:53 PM
Bob S
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Just a little question. I'm a little curious. In the classical sense, a reference frame in freefall would, of...
Apr21-03 06:01 PM
pmb
56 4,685
Hi folks! Long time listener-first time caller. I am building a coil winder for building my own transformers-fun...
Nov23-05 05:26 PM
cjenrick
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After doing some work with a painter friend we were coming home and I put my arm outside of the window as we were...
Jul11-12 07:50 AM
cjjjohn2469
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Hi, I have been stuck on this question for a while, and I need help figuring it out. For a lab, we had two ring...
Nov26-12 09:41 PM
Cjjw
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I am working on programming a simulation/model of a piston engine (steam, gas, etc). I have run into some trouble...
Oct26-08 08:17 PM
cjmdjm
2 2,348
just like when any object is immersed in water it feels lighter because a net upward force is acting on it same way do...
Feb6-11 01:26 AM
JaredJames
11 3,816
I'm working on a table for a SciFi RPG to construct ship thrusters. The thrusters have a certain output in watts and I...
Oct1-11 03:53 PM
AlephZero
10 1,087
Langrangian description: one essentially follows the history of individual fluid particles (I understand this, it's...
Aug24-08 01:52 PM
Andy Resnick
5 12,105
Find the find the eigenfunctions and eigenvalues of a two-dimensional isotropic harmonic oscillator. I don't...
Oct2-07 09:12 AM
HallsofIvy
1 6,559
What do you understand about this? From high school, I just memorize the definition of it, the number of ways of...
Oct21-07 06:18 PM
pmb_phy
9 2,700
1 u = 1/12 of the mass of a neutral carbon atom with nuclear charge 6 and mass number 12, 1 u = 1/12 * 12.000000...
Jan12-08 12:57 PM
f95toli
1 1,919
I'm not sure does which surface facing the object matters? For example, ...
Sep17-08 03:59 PM
Redbelly98
9 1,503
Consider a scenario of a sound wave inside a closed end and opened end tube. We always learn that the displacement...
Oct21-08 05:59 AM
cks
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I want to superpose two laser beams to create the beat frequency. I design the system to be like this . Two...
Nov1-08 10:53 PM
cks
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In order to increase the diffraction efficiency of the AOM, we need to reduce the beam size of the laser. According to...
Nov10-08 08:14 PM
cks
2 1,196
I learn that increase of the beam size of the laser before coupling it to the fiber can increase the coupling...
Apr6-09 01:50 PM
cks
3 1,840
I want to ask, is counter propagating beam written as co-propagating beam? which means two beams that are...
Apr7-09 06:21 PM
Andy Resnick
1 1,734
Hihi, I put a photodiode's legs to both the input for a differential amplifier ...
Aug10-09 04:44 PM
flatmaster
2 1,422
A light passing through a lens will be focused for a converging lens. However, to look at it carefully, it'll not...
Nov18-11 09:58 AM
sophiecentaur
8 2,476
According to my knowledge and understanding of things, mirrors reflect light perfectly because they are almost...
May14-10 08:11 PM
Redbelly98
8 1,623
"Mike Fontenot" <mlfasf@comcast.net> a écrit dans le message de news: 43E7D485.F1B9B47B@comcast.net > My...
Feb14-06 06:00 AM
Cl.Massé
0 755
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
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"Jay R. Yablon" <jyablon@nycap.rr.com> a écrit dans le message de news: O972h.538$zB4.459@twister.nyroc.rr.com >...
Nov4-06 06:21 PM
Cl.Massé
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"Thomas Mautsch" <mautsch@ethz.ch> a écrit dans le message de news: 45493e51@news1.ethz.ch > Dirac's belt trick is...
Nov20-06 06:38 PM
Thomas Mautsch
1 1,144
How does microwave produced by magnetron relate to the power? For e.g., magnetron produces 3000 MHz microwave and...
Feb9-09 05:25 PM
dipstik
1 1,269
-If you have a magnetron produce __# of microwaves, each with frequency of __ MHz, how can one calculate the power of...
Apr30-09 01:38 AM
Born2bwire
1 3,738
If a microwave generator (for e.g., magnetron or klystron used to particle accelerator) is said to have power of for...
Apr4-10 12:15 PM
likephysics
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Please explain "inducing electric field" which I found from reading about magnetron and klystron. This is what I...
May3-10 04:03 PM
CL39
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Hi, I am not super good in math so I really need some help with this math problem. I just got an unfair speeding...
May9-07 04:10 AM
rcgldr
11 9,388
Now somewhat near the end of Hyperspace, It spoke of blackholes and how light can't escape. Doesn't that mean that if...
Aug17-05 01:08 PM
Sempiternity
4 2,561
http://www.eurekalert.org/pub_releases/2005-08/epfd-ltt081905.php
Sep6-05 09:10 PM
Nam_Sapper
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OK, PF, I have an argument to settle and I need some expert advice. A friend of mine claims that it is possible to...
Oct21-13 08:49 AM
phyzguy
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Hi there, I was wondering if you could help me with a question I have (I've posted it here as opposed to the homework...
May9-04 11:53 AM
Claire84
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Hi everyone! As Im new to this, Im not sure where I should post my question so I thought I'd give in here a go... ...
May9-09 05:22 PM
ClaireT
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How is it that light disperses from a point source (like a pinhole w/ a light shining through). From my understanding,...
Dec18-09 07:46 PM
clalburn1420
5 2,684
I am wondering... say an object was put directly on a lens and you wanted the projected image to focus at around 3 cm...
Dec19-09 04:02 PM
Andy Resnick
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