Sources Definition and 517 Threads

SpectroscopyNow.com http://www.spectroscopynow.com/Spy/basehtml/SpyH http://www.spectroscopynow.com/Spy/basehtml/SpyH/1,1181,0-8-1-0-1-about_this_site-0-0,00.html the site.

when two souces are used, how many sources must be blocked by the object to produce the unbra? and the penumbra? I looked it up in my textbook and on the internet and i still can't find the answer.

(Any help whatsoever is greatly appreciated) I am looking for good online sources to help me understand relativistic formula's for the equations of Maxwell, and all the stuff that follows from it (like Cherenkov radiation). I realize that's a pretty vague description, so if there is no...

I think we have 3 primary sources on the Earth. 1st – Sun (nuclear fusion) Coal, oil, water dam – it would not exist without the Sun 2nd – Earth (nuclear fission) Hot geysers 3rd – Moon (gravitational force) When it moves ocean waters Anything else is just a secondary energy...

any of you guyes know some decent sources for tight-binding (LCAO) theory? i wish to use the orbitals and the position of the atoms and the angle between the orbitals for calculating the resonance and overlap integrals, but it's hard to find specific sources... so if you happen to know any...

Power Sources in Series/Parallel...? hey, I've got a question. say you had one power source that's about 4v and another that's about 3v. if you hooked them up in parallel the following power source would be (now im' pretty sure I am doing this right..if not..well I am not an electrical...

Consider the current loop in the figure below. Figure: http://east.ilrn.com/graphing/bca/user/appletImage?dbid=1450953670 Determine the magnetic field (in terms of a, I and d) at the origin. So I will use mu as the permeability of free space. Since the two vertical wires have opposite...

I've been attending at high school and I have some ideas about complex numbers. I shared my thoughts with my math teacher. He decided to search. I want to make sure if none have thought them so I need some information about complex numbers. Could you offer me some written sources and the...

For those who would like some technical references, DOE Handbooks are available on line at: http://tis.eh.doe.gov/techstds/standard/standard.html Just click on the PDF link. Look for: DOE Fundamentals Handbook, Classical Physics, DOE-HDBK-1010-92 DOE Fundamentals Handbook...

I have problem with a circuit. It has two sources of emf, and I'm not sure how to calculate the magnitued of the current in the circuit due to this. Here's what the circuit looks like (R's are resistors, *'s are just for spacing): |----------+|1|------| |*************** | R = 5...

i am a little confused as to whether light intensity at a point source is critical to how the energy will fall off(i know inverse sq ). if there is equivalent intensity from 2 sources will there be the same energy at any given distance? sorry if that is a little convoluted... here is a more...

As many may know, the bacteria Rhodoferax ferrireducens has the ability to take various types of sugar and "convert" it into electricity. Many of you also know that gas prices have sky rocketed. Where am I getting here? I plan on doing a experiment using R. ferrireducens and ethanol from...

positive charges are sources of electric field and -ve charges are sink. what are sources and sink of gravitational fields?

Does solar cell really only absorbs energy from sunlight? What about other sources of radiation such as thermal radiation? Wouldn't it be great if there are some devices that can recycles energy produced in major cities and convert it into electrical energy?

A train is traveling toward you at 120km/h. The train blows its 400Hz whistle. take the speed of sound to be 340m/s. what's the frequency do you hear? f'=f/(1-vs/vo) 400/(1-(4.32x10^8 / 340)) i got 4.32x10^8 = 120000m * 3600sec what am i doing wrong? The possible answers are: which is...

As we know, the United States consumes more power than any other country in the world. The success of the U.S. can be directly related to its power consumption. Most of our electricity comes from burning fossil fuels (Coal) that puts Co2 in the atmosphere, this is causing major pollution. The...

what is the difference between a phosphorescent source and a fluorescent source? How does a flashlight can be luminous? How can it also be nonluminous? Which kind of light source would be safest to use in building or mines that may be filled with explosive gas?