Sources Definition and 538 Threads

A tertiary source is an index or textual consolidation of primary and secondary sources. Some tertiary sources can be used as an aid to find other sources. The exact definition of tertiary varies by academic field.
Academic research standards generally do not accept tertiary sources as citations.

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  1. V

    Circuit with two voltage sources, finding voltage at nodes

    Okay, so why is it that Vc assumed to be 12v - 0.7v (D1), how about contribution from the 9v battery?? Why is this not affecting the voltage at node C? Why Vc isn't 9v - 0.7v (D2) = 8.3v?
  2. E

    B LIGO: Detecting Gravity Wave Sources

    I would have a question to LIGO. How can LIGO detect the source of a gravity wave? It's a 2-dimensional detector, which has a certain length and a certain width, but no height. How does LIGO know the direction and distance of the source, and if this source is on the one side of LIGO or exactly...
  3. Dadface

    Can arXiv papers be considered as reliable sources of information?

    Is it correct to assume that, in general, authors who have papers accepted by arXiv eventually try to get their work published in a journal? If so what should we make of arXiv papers which apparently do not get accepted by any journals? Should we take those papers as seriously as we would take a...
  4. L

    Decreasing the distance between the wave sources....

    Homework Statement Imagine a interference pattern like the common water-wave interference pattern. What effect would decreasing the distance between the 2 wave sources have on the interference pattern? Homework EquationsThe Attempt at a Solution A change in the distance between the two...
  5. B

    KCL Problem with Dependant sources

    Homework Statement I'm trying to find the voltage drop V1 of the following circuit, assuming Vin=1v, and for the life of me can't seem to get the right answer. Homework Equations KCL, Ohm's law The Attempt at a Solution I basically tried to use KCL at the top node, Vin/2+2V1 = V1/3 +...
  6. DoobleD

    B Are photons the wave sources of Huygens-Fresnel principle?

    1 - Huygens-Fresnel principle states that every point in a light wave is itself a wave source, 2 - light is made of photons, 3 - photons have a wavelength, they are QM objects. Hence my question : are photons the actual wave sources in Huygens-Fresnel principle ? Or are those two...
  7. CricK0es

    Interference from coherent light sources

    Homework Statement Four equally spaced coherent light sources (n=4) with a wavelength of 500nm are separated by a distance d = 0.1mm. The interference pattern is viewed on a screen at a distance of 1.4m. Find the positions of the principle interference maxima and compare their width with that...
  8. S

    Missing 24 Micron Counterparts for Methanol Multibeam Sources

    I was searching for 24 micron counterparts(in the MIPSGAL catalogue) for Methanol Multibeam sources but found them missing for most of the cases. What could be the posssible reason?
  9. Cocoleia

    Mesh analysis with dependent sources

    Homework Statement I need to use mesh analysis to find the three currents: Homework EquationsThe Attempt at a Solution The answers are I1= -1.25A, I2=0.125A and I3 = 1.125A I don't know where I messed up for I3
  10. MathematicalPhysicist

    A A question regarding Schwinger's Sources' Theory

    I was under the impression (false one appraently (I read Lubos Motl answer in stackexchange)) that Schwinger's theory which is covered in his three volumes called "Particles, Sources and Fields.", is really only a different interprataion to QFT, but the end results are the same. Now I read the...
  11. Eureka99

    Where to Find the Best Quantum Mechanics Resources?

    Hi everyone, I wanted to know if any of you knows very good sources for quantum mechanics and spectroscopy fundamentals, like greats books, youtube videos (lectures), or any other option. I' m studying spectroscopy at the moment, and last year I've done the Physical Chemistry II course ( quantum...
  12. K

    Monochromatic RGB light sources passing through a prism

    It is well known that chromatic dispersion occurs when a white light source is incident on a prism. The index of refraction (of the prism) is greater for shorter wavelengths hence the colours emerge from the other side with an angular spread. However I am interested to know the detailed reason...
  13. Biker

    Electrical circuits with resistors and variable voltage sources

    Homework Statement The following picture illustrate how the current in the circuit changes when you change ##E_2##. Where slope 1 represents the current flowing through ##E_1## and slope 2 represents the current flowing through ##E2## Homework Equations Usual circuit laws :P The Attempt at...
  14. kiwaho

    A Why so big of a difference in cross section by different sources?

    if you look up the cross section in Janis books, usually for same reaction, different cross sections are quoted by different laboratories. For example, the values of thermal neutron capture reaction 9Be(n, r)10Be: EAF-2010, 0.0075b ENDF/B-VII.1, 0.01b JEFF-3.1.2, 0.0088b JENDL-4.0, 0.0085b...
  15. B

    Synchronous Sources and Interference

    Hi, What is the scientific definition of "synchronous sources" when we talk about the conditions of interference? Thank you.
  16. O

    Harmonic sources, flowing from load, why?

    I have been thinking of this and can not seem to understand why nonlinear loads can be tought of harmonic current sources injecting current back into the grid? For example if you connect a passive filter in parallel to attenuate the 5th harmonic, the 5th harmonic would flow between the filter...
  17. Dan LaSota

    Faraday Rotation Effect Lab -- sources of components....

    I appreciate the link to the field strength calculator. http://www.calctool.org/CALC/phys/electromagnetism/solenoid I'm also looking for recommendations on sources for magnets. What I'm trying to do is put together a Faraday Rotation Effect Lab. This is my Faraday Rotator, a 12 cm x 2.0 cm...
  18. Algr

    B Is Quantum Mechanics the Key to Unlocking New Energy Sources?

    While I am sure that knowledge of quantum mechanics is vital for getting fission and fusion reactors to work, I can't help noticing that the actual function of those reactors can be described purely with classical physics. Are there any proposals for quantum reactions to unlock energy...
  19. C

    A circuit with multiple sources of voltage

    Homework Statement Solve this circuit: a) Mark all currents b) Write a system of equations allowing you to solve for the currents2. The attempt at a solution Part a) in attachment. Part b) \epsilon_1 = i_1 r_1 + (i_1 + i_2 + i_3) R \epsilon_2 = i_2 r_2 + (i_1 + i_2 + i_3) R \epsilon_3 =...
  20. D

    Superimposing 2 sources of light slightly out of phase

    Assuming for now a simple photon particle model for light, where you have a stream of photons traveling with a certain frequency. Picturing this in my head on a number line, with just 3 photons at a time, and let's just say the wavelength is 1 and speed is 1, and at time t=0 we have a photon at...
  21. D

    Engineering Circuit with multiple voltage sources

    Homework Statement a. Find the voltages Va, Vb, and Vc. b. Find the currents I1 and I2. Homework Equations Ohm's Law, Current Divider The Attempt at a Solution [/B] My first attempt was to redraw the circuit. I know that these voltages are with respect to ground. Therefore Va to Ground is...
  22. M

    Use KCL and KVL to find the power supplied by the two ideal sources

    Homework Statement The Question wants to find the Voltage Across The Current Source 2A and 5A Homework Equations KVL KCL Ohm's Law The Attempt at a Solution I tried to Using KVL and KCL for all Closed paths and node but I just Couldn't Figure how to relate them to find the voltage across the...
  23. J

    I Any sources on how to generate a nomogram?

    I've been very interested in analog computers lately, and a simple application of one has come up at work where I simply need to solve for RPM given a part diameter and feed (tangential) speed. It's simple enough to do the calculation in each instance, but I think it would be useful for the...
  24. kdrdgn07

    Engineering I need Russian sources (Aerodynamic and Flight Mechanics)

    Hi guys. I need ur suggestion. Firstly, (I got to say that I'm new about this topic) I'm studying mechanical engineering and It's my first year. I've never learned about fluid mechanics or termodynamic or differantial equations before but I'm dealing with Aircrafts especially UAV. I've read...
  25. Arij

    Diff eq - LT Discontinuous Sources HW

    Homework Statement Homework Equations The Attempt at a Solution this is my attempt, I figured this would be easier than typing. any how, I find partial fraction method is so time consuming and very algebraically complicated, is there a trick or another method I could use to make this...
  26. S

    How Do Current Sources and Resistors Interact in a Circuit?

    Homework Statement Combining the current sources of the given circuit. I've attached the circuit diagram below. The Attempt at a Solution [/B] Since the sources are in parallel I can just add up the values to get an equivalent source and same for the resistors. I'm curious in the proof of...
  27. CentrifugalKing

    Circular Wave Fronts Emitted by Two Wave Sources

    Homework Statement https://session.masteringphysics.com/problemAsset/1383558/3/21.EX26.jpg Make a table with rows labeled P, Q, and R and columns labeled r1, r2, Δr, and C/D. Fill in the table for points P, Q, and R, giving the distances as multiples of λ and indicating, with a C or a D...
  28. F

    Topology Sources about Killing vector fields?

    I'm interested in Killing vector fields and want to ask whether anybody can name me a good textbook or online-source about them, preferably with a general treatment with local coordinates as examples and not at the center of consideration.
  29. P

    Short Aerial: Find the scalar potential (retarded sources)

    Homework Statement Determine the vector potential due to a short wire running from (−L/2, 0, 0) to (L/2, 0, 0) carrying a current I = I0cos(ωt) (consider only points at distance r >> L from the origin). (You may neglect the effect of the return circuit.) Now determine the corresponding scalar...
  30. nathanxx6969

    Current Across Diode for DC Sources: 0.86mA

    Homework Statement :Find the current that go across the diode ans=0.86mA[/B] Homework Equations V=IR 3. The Attempt at a Solution The Vt(v total) is 30v so,must i ignore the diode as off first?.In that case the current is 30/20=1.5 mA. i also know the that diode is foward bias because...
  31. B

    Are "Think Tanks" Good Sources of Info., Biased?

    What are your opinions about think tanks? 1.) Do you accept them as reputable, valid, and/or useful sources of political, social, and cultural commentary and analysis? 2.) Which think tanks do you find most reputable? 3.) Is there normally a bias associated with think tanks? Do...
  32. S

    History Online Primary Sources for History: Guide & Recommendations

    Where can I find online primary sources for history?
  33. person_random_normal

    Incoherence of Light Sources: Phase Difference & Intensity

    Why will it happen so that-two light sources such that the ''phase difference between the two vibrating sources changes rapidly with time, we say that the two sources are incoherent and when this happens the intensities just add up '' assuming that the wave characteristics of light are significant
  34. Paul Colby

    A Why are low pressure gas discharge lamps thermal sources?

    When an atom makes a single photon transition it adds a single photon to the radiation field. One might then expect that a low pressure gas discharge would emit photons in Fock states? How is it that photon of an atomic spectral line produced in a low pressure gas discharge become thermalized?
  35. P

    I Material detection with radiation sources

    How are radiation sources like neutron or gamma/x-ray emitters used to detect materials? In particular illicit explosives and nuclear material and the such?
  36. Matt atkinson

    Power from two sources, electrically assisted bicycle

    So I'm just doing a project where i have a electrically assisted bicycle and I am struggling working out the power when the bike is going uphill. If i have a certain force provided by the rider, and a force provided by an electrical motor; can I do Power=F_{motor}* v_{motor}+F_{rider}*v_{rider}...
  37. G

    Thevenin's circuit analysis. Multiple voltage sources

    Hi, i am halfway through one of my assignments and i require some assistance. I do not seek the answer to the assignment just a little boost to my knowledge. 1. Homework Statement Basically, if i am calculating the Thevenin's voltage and the resistor i have removed that is in question has a...
  38. goonking

    Engineering Circuit question -- Two sources and two resistors....

    Homework Statement [/B] Homework EquationsThe Attempt at a Solution Applying KCL at the node , assuming current flows from left to right at the 4 ohm resistor: Vo/4 + 10 + 2Vo = 0 OR, is it : Vo/(4+6) + 10 + 2Vo = 0 since the two resistors are in series?
  39. Rampart

    Classical Extra sources of information(electromagnetism)

    Hello there guys. As the title says, for quite some time now I've been looking for some extra sources of information. I am working with the book "introduction to electrodynamics" by David J Griffiths and even though it is good, I am thinking that it would be better to enrich my studies in this...
  40. Jonathan Scott

    A Could gamma rays imply GW sources not black holes?

    When I saw the report of a gamma ray burst associated with the LIGO GW event, my immediate thought was that the obvious explanation is that the compact massive objects were not in fact black holes, and the gamma ray burst was from the energy of the final collision and merger. This would...
  41. P

    Parallel Power Sources: Use 2 12V 75W Chargers for 150W Project

    Hi, I am trying to make one of my project plug into the wall. It needs 150 Watts, at 12 volts. I am going to use laptop chargers to power it, but I only have 2, 75 Watt chargers. Both of the chargers are 12 volt chargers, and I was wondering, could I use these two chargers in parallel to...
  42. naima

    Interferometry of distant sources

    When you try to get fringes, the worse is when the source is extended and the light has a large energy spectrum. With a star, the source seems pointlike. Is there another advantage as regards with bandwidth?
  43. Y

    Three-Phase Delta Network: Not all Voltage Sources are 120V?

    Using the Delta Netowrk from this image: http://www.belden.com/images/B23_WyevsDelta.jpg Between Y-X, there should be 120V. Between Y-Z, there should be 120V. Between X-Z, there should be 120V. But wait! If we assign values to make the above statements true... Call X = 0V, and Y = 120V, so...
  44. katatosh

    Help finding sources for research paper

    Hello all! I am a senior in high school with a love for physics. In English, we were assigned an argumentative research paper with a topic of our choice. So, naturally, I chose String Theory, since it is a semi controversial topic in theoretical physics today. My only problem is that I have a...
  45. kostoglotov

    Two voltage sources and two loads, how to approach this one

    Homework Statement imgur link: http://i.imgur.com/G9RKEH1.png Homework EquationsThe Attempt at a Solution [/B] Should I just consider that A and B are parallel with each voltage source respectively and so therefore that's the voltage drop that they experience individually? The ground...
  46. Y

    Adding two current sources give me the wrong answer....

    I have to find current Ix. Equations: None My approach: 1) Turn 60<0 and 2+4j impedances (top left of circuit) into current source parallel to impedances. 2+4j = 4.47<63.43 Current source = 60<0 / 4.47<63.43 = 13.423 < 296.57 2) The two impedances 2 +4j are now in parallel with the 6 ohms...
  47. M

    Looking for sources for deprecation of relativistic mass

    I am interested on the earliest reference on the deprecation of the concept of relativistic mass. AFAIR even Einstein used relativistic mass and the somehow related concepts of transversal and longitudinal force. I am trying to find a long lost article about showing all these concepts related...
  48. DuckAmuck

    Online Sources for Kepler Exoplanet Data

    Does anyone know the best online source(s) for kepler exoplanet data? Thank you.
  49. GiantSheeps

    What Are Common Sources of Error in Flame Test Labs?

    Homework Statement In a flame test lab, where different unknown substances are heated and the identity of the substance is determined by the color emitted, what can be some sources of error? Homework Equations n/a The Attempt at a Solution I need three sources of error, and so far I have...
  50. Dishsoap

    Sources for opinions on graduate application essays?

    Greetings all, Are there resources around to help with writing essays for graduate applications? I have asked a few professors around my department, but as we don't have a graduate program and most of them are young professors who have only recently left grad school themselves, most of them...
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