What is Source: Definition and 1000 Discussions

Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. It most commonly refers to the open-source model, in which open-source software or other products are released under an open-source license as part of the open-source-software movement. Use of the term originated with software, but has expanded beyond the software sector to cover other open content and forms of open collaboration.

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  1. T

    PV Basics: Learn V(open circuit), Ishort, Fill Factor

    Dear Forum Members,, I would like to learn photovoltaics. There are some parameters like V(open circuit), Ishort, fill factor etc. And also i would like to learn the graph of intensity to Voc and Ishort. Could you suggest me to which source i need to look? Thanks
  2. Abdullah Almosalami

    Constant Current Source in Driving an RC Circuit

    Alright. So I'm getting two different solutions depending on how I look at this problem, and I know one is correct but I don't know why the other would be incorrect. So, given this general circuit of a constant current source driving an RC circuit in parallel: Now, what they tell me in class...
  3. K

    Quantum The main source books for quantum mechanics?

    I would like to know which books are the main sources for the Quantum mechanics 1/2 courses, and the professors use them most during their courses? Thanks for you reply in advance.
  4. N

    I Collimating an extended source to infinity?

    I need to collimate an extended source (for example a cell phone) to infinity or as far as possible. I show an illustration below The collimator lens is about 2cm from the eye and the extended source is about 60cm from the eye. My understanding is that a collimator lens with a focal length...
  5. Castello

    Determine the value of the voltage source Vx

    Homework Statement Find Vx, as the 5A current source provides 50W to the circuit. Homework Equations ##P = V.I## ##U = R.I## The Attempt at a Solution [/B] At first, as 5A current source provides 50W, by ##p=vi## there should be 10v through it. Then, i applied KVL and found four equations...
  6. Castello

    Thevenin equivalent by source transformation

    Homework Statement Find the Thevenin equivalent at terminals a-b V1 = 70V V2 (dependent) = 4Vo R1 = 10Kohm R2 = 20Kohm Homework Equations ##V=RI## ##1/req = 1/r1 + 1/r2 + ... +1/rn## The Attempt at a Solution Found the current i = 1mA by KVL using Vo = 10ki then did source...
  7. P

    B Speed of Light -- Why doesn't it add to the speed of the emission source?

    My question is about the speed of light. Our current understanding of light says that light is constant for all observers, and uses time dilation to explain this. Have we proven this? The speed of light emitted from a stationary object is equal to C. The speed of light emitted from a moving...
  8. A

    MHB Calculating New Emission Rate of Radioactive Source

    A radioactive source emits particles at an average rate of 1 pe second. Assume that the number of emissions follows a Poisson distribution. The emission rate changes such that the probability of 0 or 1 emission in 4 seconds becomes 0.8. What is the new rate? Thanks.
  9. Samuel Gosselin

    Which electromagnetic waves does a source emit?

    If a source emits high frequency electromagnetic wave, for example gamma rays, does it imply that it also emits all the waves of lesser frequency?
  10. Lapse

    Engineering Finals Study Time A Two Source Circuit w/Inductor, Cap, and Resistor

    Homework Statement Homework Equations Z = √(XC2 + XL2) XL = 2πƒL XC = 1 / 2πƒC I = V/Z The Attempt at a Solution First off, thank you for all of the help this semester. I'm sure you'll be seeing questions from me in the spring also. Here is how I'm thinking about this problem: 1. Using the...
  11. S

    Engineering Solving a Circuit with a Complex Source

    Homework Statement An image of the problem is attached. I need to solve for ic(t) and vc(t) by adding a complex source. Homework EquationsThe Attempt at a Solution I don’t know where to start here. I don’t understand the question, and I can’t find the information I need in my notes. Can...
  12. I

    Optical Path with a light source inside a gradient medium

    Hi, I am wondering if anyone could point be to any references for gradient optics. The current literature seems a little haphazard. The model I am looking for would need to consider the following. Single medium whose optical density (index of refraction) is some gradient index of refraction...
  13. Shivang kohlii

    Current through source in AC circuit with R & LC in parallel

    Homework Statement In the circuit diagram shown , Xc = 100 ohm , XL = 200 ohm , R = 100 ohm , the effective current through the source is ? Homework Equations Z= √( R^2 + ( XL - Xc)^2) Vrms = Irms/ ZThe Attempt at a Solution I tried to draw the phaser diagram and calculate the relation...
  14. ParticleMan

    I Open Source Quantum Mechanics Visualization Software

    Are there any folks here who use open source alternatives to Matlab and Mathmatica for visualization of quantum mechanics? Also, are you aware of any introductory quantum material for that tool? If not, do you think such a thing would be worthwhile for visual leaners? Why or why not? I have...
  15. N

    Calculate the power measured by the detector at distance h from the source

    Homework Statement An isotropic point source radiates electromagnetic energy, and its output is measured by a thin disc-like detector of radius R. Calculate the power measured by the detector at distance h from the source, assuming that the plane of the disc is orthogonal to the line of sight...
  16. F

    I Normalized source function: physical interpretation

    Hello, In physical radiative processes, I am studying the solution of the following equation : ##S=(1-\epsilon) J + \epsilon B## with : 1) S the source function 2) J the mean intensity ( ##J=\dfrac{1}{2}\int_{-1}^{1} I_{\nu}\text{d}\tau_{\nu}##) 3) B the Boltzmann distribution 4)...
  17. YMMMA

    Electricity: 2 charged rods connected to a voltage source

    Homework Statement In addition to the question given in the attached file below, I don’t understand how is the polarity changing periodically. Homework Equations Concept-based question, I guess. The Attempt at a Solution I have no idea how should I approach the question. So, if anyone has an...
  18. DrChinese

    A Novel entangled photon source with heralding

    Just saw this article from a highly respected research team, and thought some might enjoy seeing how the state of the art continues to develop rapidly: 12-photon entanglement and scalable scattershot boson sampling with optimal entangled-photon pairs from parametric down-conversion Han-Sen...
  19. E

    Voltage drop in the internal resistance of a voltage source

    In this circuit,first there will be voltage drop in the internal resistance of the voltage source.Mostly,the voltage source is assumed ideal in circuits,however,here a practical voltage source is assumed. So,there will be voltage drop in the internal resistance of the voltage source which will...
  20. R

    MHB If you are 8 ft away from the source, how long does the sound take to reach you?

    The speed of sound is 761.2 mph, or, according to my math, 1116.5 fps. If you are 8 ft away from the source, how long does the sound take to reach you? What is the formula for doing this? I divided 8 into 1116.5, and got 139.5 - but that doesn't seem to tell me anything. Obviously, the answer...
  21. vincent

    I Does a Photon Carry Velocity of Its Source?

    Earth is moving through space. If I throw a ball straight up, it falls down to me and is not left behind. This is obviously because it already carries the momentum of Earth's movement. But if I fire a photon straight up, does it also carry a velocity component in direction of Earth's movement...
  22. B

    I Double slit one source same as no slits with two sources?

    Instead of using a single source and two slits, imagine just using two sources the same distance apart as were the slits... The two sources are controlled by a device that has two modes of operation, selected by a two position switch labeled D and R: D is "determined" - the emission from the...
  23. Lukeblackhill

    I Source of Energy in a Field of Forces

    good evening! My question is the following: it is well stated that energy is conserved in any isolated system, and we can in most circumstances expand our system to a many-steps conversion of energy, but always conserved. The classic example could be the energy of the sun stored in form of...
  24. J

    Engineering AC Source driving an RLC circuit....

    Homework Statement 10 v, 100 hz goes into a circuit of a 1o resistor, a 1o inductive reactance and a 1o capacitive reactance that are in series. What is the current. What is the V across the cap. Homework Equations and the attempt at a solution[/B] So I know I = V/Z and Z = sqrt( R^2 +...
  25. S

    Three-part Problem: Thevenin + Dependent current source

    Homework Statement The diagram of the electric circuit, the problem statement (and an attempt) are included in the file below.: https://www.docdroid.net/RD0ZEgA/question-3.pdf Homework Equations Dependent Current Source Nodal analysis Short Circuit Current Thevenin Voltage Thevenin...
  26. ?

    Number of waves from an oscillating source in one period

    Homework Statement A mass m attached to a spring of spring constant k emits sound at frequency f, detected by a collinear observer at distance r. If the mass has maximum velocity v_0, what is the total number of waves the observer detects in one period of oscillation? Homework Equations...
  27. jedishrfu

    B Blazar as the Source of Cosmic Neutrinos Confirmed

    Read more at: https://phys.org/news/2018-07-century-old-riddle-resolveda-blazar-source.html and a second article from Ars Technica: https://arstechnica.com/science/2018/07/icecube-spots-a-neutrino-source-a-black-hole-jet-pointed-at-earth/ showing how multi-messenger astronomy is...
  28. A

    I Open source software for integer programming

    I don't usually need help in locating software, but I'm having a heck of a time tracking down a good open-source bit of software which solves integer programming problems using arbitrary precision! If I don't find one soon, I'll need to write it myself. Which I don't mind, but it's silly to...
  29. R

    B Measuring the speed of light from moving source of light

    The speed of light from a moving source of light is usually recognized indirectly, based on various explanations of phenomena. The speed of light is fairly simple directly measurable on the basis of autonomous and separate measurements of the frequency and wavelength of the light. Is a similar...
  30. S

    I Could a Smoke Detector Serve as a Sail for Spacecraft Propulsion?

    Looking at a humble smoke detector - a metal plate with some alpha source on one side. I guess the fission products / apha etc emitted in one direction are absorbed into the metal, and the opposite direction go into space. So there should be a minute net force ? Would that be useful as a "sail"...
  31. B

    IR camera 1550 nm IR light source

    I am looking for an IR camera that can pick up 1550 nm IR light source on the pix level. I have silicon wafers and I am going to hit the pixels with a 1550 NM IR light source and I want to be able to see the pix with a IR cam. I want to connect it computer and use a C# application to view the...
  32. A

    Is the source in parallel or series with the resistor?

    Thank you for your time and effort. It is much appreciated. 1. Homework Statement I have attached the problem with the solution to this thread. Basically, the problem asks to construct the circuit model for a generic device by using the data of terminal current and voltage measurements. From...
  33. A

    Treating an inductor as a current source?

    https://imgur.com/a/Yb2vpmp why can the inductor be treated as a 1A source?
  34. T

    Best Open source projects to contribute to?

    Hi, I'm looking for open source projects to contribute to to build my resume and computer programming portfolio to hopefully land a computer-related job. What are good open source projects that I can contribute to?
  35. J

    AC voltage source driving an inductor and a capacitor

    Homework Statement Homework EquationsThe Attempt at a Solution I don't understand why would the current be zero in any of the branches . May be I am missing something very fundamental . Please help me understand this question .
  36. ChrisVer

    Question about running "executables" without source code

    I have a simple question I guess, basically by how classes etc are formed. In general a class in C++ has some categories such as private, public and protected, which okay everyone knows/can find what they are meant for. E.g. a private member will not be accessible outside the class member...
  37. J

    Method of images for a line source

    Homework Statement Consider the curve C (image attached). C coincides with the real-z axis for $$|z| > a$$ and, in $$|z| < a$$ C coincides with the semi-circle $$|z| = a, =z > 0$$ In terms of simple singular flows, what is the image in C of a line source of strength 2πm lying at z = z_0, above...
  38. C

    Modeling a Heat Source with the 2D Heat Equation

    Homework Statement Hi, So I have a perfectly insulated rectangular plate and I trying to use the 2D heat equation in conjunction with numerical finite diference methods and MATLAB to see how the temperature changes throughout the plate. My issue is with the heat source. I am supposed to decide...
  39. D

    B Unraveling the Mystery of Universe Expansion: Exploring External Energy Sources

    So I was doing some studying and got a question on why the rate of expansion of the universe was increasing, and it got me thinking. Newton's first law states that an object in motion will remain in motion with a constant speed unless an external force acts upon it. If the expansion of the...
  40. mjda

    I Stellar Thermal Energy with no Nuclear source

    Can anyone enlighten me as to why the total thermal energy of a star will increase with time if the star has no nuclear energy source?
  41. Murphy.T

    Potential Energy of an Electron near a negative source charge

    If an electron starts from rest 85.0 cm from a negative fixed source charge of -0.135 micro coulombs we use the equation ke final - ke intial + pe final - pe intial. In solving you use ke = pe which appears to cancel out the inital kinetic and potential energy but how can the initial potential...
  42. ryan liberty

    I Source of the weather on Neptune

    With the fastest sustained wind speeds in the solar system of 700mph. The main explanation I have heard is Neptune's primordial heat from it's formation combined with the lower atmospheric drag due to lower temperature. Neptune's southern hemisphere is currently in summer and has gotten warmer...
  43. phyzguy

    Open source adaptive mesh code

    I want to start a project that requires parallel code for adaptive mesh refinement. I don't want to re-invent the wheel, and was hoping to leverage an open source library as a starting point. Does anyone have experience with any of these codes and could make a recommendation? At this point I...
  44. Rahma

    Help with MCNP v5 SDF Card Source Definition

    hello i want to know if MCNP version 5 can define 8 sources by sdf card i need a help please
  45. Derek P

    I Require a source for a delocated photon pair

    The light source in the DCQE experiment of Kim et al is a laser which illuminates two slits which are immediately followed by an SPDC. The latter is therefore excited coherently in two narrow stripes referred to as "slits". The output has a small amplitude of down-converted entangled pairs. The...
  46. L

    MCNP source definition question

    I'm modelling a scenario for the research that I'm working on, and I got the cells and surfaces all mapped out for the environment finally, but now I'm totally stuck on creating a source. I'd like a point source of Californium-252, but after hours of looking, I don't see any out of the 1000...
  47. Facial

    What is the main source of Earth's internal heat?

    I've been wondering about this question for some time now. There are the following two contributors: ~~~~~~~~~~~~~~ 1. Heat left over from the planet's initial formation. In the early 19th century Lord Kelvin estimated the temperature based on a homogenous sphere of uniform initial temperature...
  48. J

    B How do we know we have a single-photon source?

    In the double slit experiments , with 'Single photon emission'. Taking into account the arguments above referring to one photon,, how do we establish that exactly one photon was emitted by the source. In the light of the above explanation , is it not possible that they are may photons in a...
  49. goldensquid2000

    Voltage across a Capacitor More than the Source Voltage?

    Hi everyone, I'm new to this forum so I apologise in advance if I may have posted in the wrong forum or made a similar error. I recently conducted an experiment with some peers where we measured the voltage across a charging capacitor in an RC circuit over a period of time. The diagram is...
  50. C

    Biasing a MOSFET with constant-current source

    Homework Statement Hi, I'm just going through amplifier circuits and I'm having some trouble with amplifiers in which the MOSFET is biased by a constant current arrangement. Here's my issue: In the MOSFET saturation equation, if we set ID, we will be able to obtain Vgs. Which means that if...
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