Sources Definition and 517 Threads

Hello there, Does anyone know some good sources (preferably on the Internet) for Monte Carlo and Inverse Monte Caro methods (especially the latter)? There is plenty of stuff to find on Monte Carlo, I am particulary pleased with Stefan Weinzierl's 'Introduction to Monte Carlo methods'...

Homework Statement 1) A 24 cd point source lamp and a 73 cd point source lamp cast equal illuminances on a wall. If the 24 cd lamp is 6.3m from the wall, how far from the wall is the 73 cd lamp? Answer in units of m. 2) Two lamps illuminate a screen equally. The first lamp has an intensity...

I am not sure if I should be using this board or the nuclear board but I chose this board because it is for class work. Anyways over the past few months I have been collecting data from radioactive sources (Th-230, Am-241, Po-210, Pu-238). Now I understand that the number of events divided by...

Can someone point me to good books or good web links that deal with standard light sources (standard lamps to be precise) used in spectroscopy?

As we know, nearly all energy we utilized is transformed from matter, such as chem reaction, biochem process, nuclear reaction,... and the most efficient way that could transform all matter to energy now we know is the reaction produced by matter with its anti-matter. But the cost is much...

I am a little confused about the change in frequencies. I am working on a problem involving a train. The train is moving at a constant velocity and blows its horn at a certain frequency. I know that the frequency heard by those on the train station will be f1= f/(1-(Vs/Vsound)) when the...

Hey guys having a bit of problem with my year 1 essay. Would really appreciate any help :) What are the main sources of gamma ray bursts both short and long duration? I know some are from supernovae but where do others come from?

how do i measure the intensities of different sources of light? eg. candle light, tungsten filament etc.

I understand current sources are used to bias IC circuits, but how does the Ro (Dynamic Output Resistance) of the current source (Either simple, Widlar, or Wilson) effect the amplifier? Why is a higher Ro better than a lower Ro?

Hey guys I am new to Electrical Eng, i got a question to answer, it says that a variable resistor is connected to a " Constant Voltage Source", how does the current through the resistor changes as its resistance varies from zero to infinity? I also need with the same question, but with a...

I was thinking about a collection of monochromatic light sources with a randomly oriented phase - for example in a sodium lamp the atoms will radiate almost independently, so they should act as such a collection of incoherent light sources. Assume for simplicity each light source is classical...

1. wHAT ARE ENERGY SOURCES AND POWER STATIONS? 2.WHO WAS THE FIRST PERSON TO DISCOVER THE ENERGY SOURCE? 3.WHO BUILT THE FIRST POWER STATION AND WHO DISIGNED IT? 4.WHY DID HE/SHE DECIDED TO BUILD THAT POWER STATION THERE? 5.WHAT DO SOUTH AFRICANS GAIN FROM THAT POWER STATION? 6.IS THERE...

For the last several months I've been trying to locate sulfur in bulk so I can try out something called sulfur casting (lost-wax casting using liquid sulfur instead of molten metal). All I've been able to find is five pound bags of something called soil or garden sulfur at nurseries and home...

What would Earth's equilibrium surface temperature range be from 1. Internal fission alone 2. Gravitational tidal forces alone 3. Solar radiation alone

Greetings everyone, I am new to these forums but just by looking around a little I see that it is a community I would love to be a part of. I am a 20 year old students of Informatics technology from Greece. I do realize that what I do is not connected directly with physics or engineering...

Agree with DeepQ on the use of original sources to clarify basic concepts. (See spin thread.) It is hard, though, to find some of them in English. Any suggestions for such an older textbook? Any suggestions (journals OK) for English translations of de Broglie's thesis, and for Schrodinger's...

[SOLVED] Minimum Distance Between Two Sound Sources Homework Statement Two sources of sound face each other and emit sounds of equal amplitude and equal frequency but are 180 degrees out of phase. For what minimum separation of the two speakers will there be some point at which (a) complete...

[SOLVED] Amplitude of Sound Waves from Two Sources at a Point Problem. Two sources, A and B, emit sound waves, in phase, each of wavelength \lambda and amplitude D_M. Consider a point P that is a distance r_A from A and r_B from B. Show that if r_A and r_B are nearly equal (r_A - r_B \ll r_A)...

Hello All, In my projects, I am constantly winding coils and more coils, which all use magnet wire of various lengts and gauges. Most of the stuff, I buy from RadioShack or eBay in50' and 100' rolls. But since I go through a lot of it, I figured it would be worth the money to just buy a couple...

Is there any way to perform the double slit experiment and see the interference pattern without using a laser? If so, what type of light do you need?

Hi there, I have a group project where we are to create (theoretically) a reliable power supply system for rural under developed areas in certain parts of the world. Now our task is under electrical engineering so it must be related to the power and ways to generate power, minimise the cost...

Can someone please explain why ideal voltage/current sources are short circuit for voltage source and open circuit for open circuit in small signal analysis? Any mathematical proof to this?

Non carbon based Alternative renewable fuel sources..Ideas out side of the Box. #1. WIND POWER using a gigantic wind sock. A Wind Drome. Let's imagine a high tensil lightweight material 1000 feet across and 1000 feet high funneling down to an opening only 10 feet by 10 feet at the small end. (...

I'm currently a Physics B student and I was wondering how you determine whether an online "Physics Tutorial/classroom" source is reliable and trustable based on the information it provides. For example the Physics Classroom. So far it has worked to my advantage but I'm not totally sure whether...

Homework Statement Find thevenin's equivalent for the capacitor between node a and b and determine Vc (image attached) Homework Equations I know I can use superposition to get Voc, but when I add the two answers together, can I combine them into a single source or keep them seperated...

Well, last night Katie Couric may have lost me for good with her ten minute interview with Karen James - wife of the climber found dead on Mt. Hood. I think it was Turbo1 who predicted that she would turn the news into the Today show, and it looks like he may have been correct. When I saw that...

My understanding of a passive summing mixer is to use series resistors to limit the voltage from multiple sources so as to not over drive the destination? If you are combining two audio channels say from a VCR and jumper the left and right channel will this have serious reprocutions for the...

How do you learn new material (internet or books) for courses? Would you think that an individual would learn more efficiently using the internet instead of using books?

Find I in the circuit using the superposition principle: My work so far: I\,=\,I_1\,+\,I_2\,+\,I_3 This reduces down to: 16\,V\,=\,I_1\,(8\Omega) I_1\,=\,\frac{16\,V}{8\Omega}\,=\,2\,A This reduces down to: I_2\,=\,-\frac{12\,V}{8\Omega}\,=\,-\frac{3}{2}...

the question is that: A long, straight, solid cylinder, oriented with its axis in the z-direction, carries a current whose current density is \vec J. The current density, although symmetrical about the cylinder axis, is not constant but varies according to the relation (the relation is in...

Hi guys, Let's assume I have a point source in a free field. Now, correct me if I'm wrong on any of the following points: As the spherical waves spread out from the point source, they will tend towards plane waves. Since planes waves lose less intensity with distance than spherical waves...

Hey, Im currently in my first year Elec Eng. Seeing how we were not exposed to much instrumentation in high school at all, I am finding some difficulity in my circuit analysis labs. I just would like to know if you would know any good books or websites that offer an introduction to circuit...

Hello, I have this problem: design a circuit using diodes, resistors and voltage sources to obtain the input function. And the input function is Iin vs Vin plot with following points connected as straight lines: (2V,0mA), (3V,2mA), (4V,6mA). I guess I need a hint on what kind of topology...

I am not sure about sources of electrons in photosynthesis and respiration. If someone can explain this that would be great?? I think the source of electrons for photosynthesis would be water and light. Am I correct? Still reading about respiration... Also occurrence in photosynthesis...

Question: Organ pipe A, with both ends open, has a fundamental frequency of 450 Hz. The third harmonic of organ pipe B, with one end open, has the same frequency as the second harmonic of pipe A. Use 343 m/s for the speed of sound in air. a)How long is pipe A? b)How long is pipe B? I...

Sir, Coherent sources are defined as sources having same frequency and constant phase difference. In some books it is given that coherent sources have constant phase difference only. Which is correct?

The voltage of an AC source is given by the equation v=180sin377t where v is the instantaneous voltage and t is in seconds. (a) what is the rms value of the voltage? (b) what is the frequency of the ac source? (c) if this voltage is connected to a 40 ohm resistor, find the equation that...

hi, I am not an US citizen, but have a plan to study phD in US. However, I have financial problem. My question is: If I am awarded a phD scholarship, is there still any other "financial sources" that I can work for to earn some more money? If I spend just enough for basic living...

Give three sources of error in your calculation in Part B. Which of these contributions the greatest source of error? Explain. In part B i did 6 steps in determination of Faraday's Constant. 1. I marked two copper strips (to distinguish them) and weigh them 2. Attach these to the...

Hey There, Can anyone help me and maybe can tell when interconnections of ideal dependent or independent ideal sources are valid? I need it please and if anyone got any link, i will be very thankfull, thank you

i keep getting stuck in this problem, i don't see what I am doing wrong. the problem says to determine which sources absorb positive power, then show that algebraic sum of the five absorbed power values is zero. i have attached a picture of the circuit, and here is what i have done: Starting...

I was searching for references on statistics and found this - StatSoft Electronic Texbook - http://www.statsoft.com/textbook/stathome.html Elementary Concepts in Statistics - http://www.statsoft.com/textbook/esc.html Basic Statistics - http://www.statsoft.com/textbook/stbasic.html

I am new to this forum, and am not certain whether this question merits a serious response, or will be laughed out. I have studied undergrad relativity (Various metrics etc), but have not made much headway with tensor maths - yet. So here goes... Something i have often wondered, is whether...

I have to write an error analysis for my lab report, but am having some trouble making my sources of error clear and precise. The lab itself was a very basic investigation of the relationship between the tension, frequency, and mass per unit length (mu) in a standing wave pattern. Some...

What is the difference between a current source using an op amp and one using a single transistor? Why would you use one over the other, etc? Thanks!

Basic setup is a photo-detector coupeled with an amplifier. Questions is what are possible sources of non-linear behaviour ? Now, one possible source is obviously the amplification of background noise, but what other sources are there ? Alternatively could one give me a book or website to...

I would like you know everybody's general thoughts on alternative fuels, and aleternative energy. Personally, I think ethanol is a great thing and I'm hoping it gets picked up by more manufacturers. Hydro-fuel cells also seem quite promising, being more efficient and not producing hazardous...

This is a thing that I would like help with. If I was sitting on the sun (impossible I know) would I see light from any other source entering my location? If not why not?

If everyone could tell me exactly what news organizations or whatever, they would consider legitimate sources? For me, I mostly trust any most mainstream news organizations to an extent. Even CNN and FOX can't bend the truth too much, but I will need to double check things if I see them...

Dear Friends, I have some questions about the efects of sink, sources and vortices. Both sink and source in fluids mechanics, are a region near a point that attracts or repels, for example, a particle. In the case of a vortice, in adition, a particle will be atract and approach towards the...