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### Physics FAQ

Quality answers to common physics questions
May25-09 10:31 AM ZapperZ

# General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
 Meta Thread / Thread Starter Last Post Replies Views Pinned: Recent Noteworthy Physics Papers ( 1 2 3 ... Last) 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 166 160,126 Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Apr22-11 05:27 AM ZapperZ 2 63,598 I know how, by Amp\grave{e}re's Law for the loop integral of a magnetic field, \oint_C \textbf B \cdot d \textbf s =... Feb5-13 11:17 PM elfmotat 1 480 Hi, just a simple question. We've always been told that microwave ovens are dangerous and to not stand near them when... Feb5-13 07:58 PM JimiJams 8 851 In high school, I learned that coherent light is light which has same frequency,phase and so on. In college , I learn... Feb5-13 06:34 PM einstein1921 15 1,454 Hey..!Its been a long time since I last posted..Any how I returned.. My question is about mEta stable states in atoms... Feb5-13 03:00 PM mathman 1 405 Hi, I have a question regarding frequency, power... Let's say I have signal with power level of X dBm and the... Feb5-13 12:13 PM berkeman 1 677 When an object move in space, what decides where it moves to? For instance there's no rule saying you can't move from... Feb5-13 11:24 AM fredreload 32 2,569 How can an incident photon cause an atom to de excite?? Feb5-13 11:17 AM Jano L. 1 347 I read the following in a book. “In order for there to be a clear image on your retina, the eye must refract the... Feb5-13 09:26 AM snorkack 4 681 In a general situation, how do you change origin (mathematically speaking) in a physical context i.e. with position... Feb5-13 07:38 AM qwop 2 404 I am doing a project on piezoelectricty and i need to know where to get piezo disks that will have this effect... Feb5-13 07:28 AM jedishrfu 1 366 I need more help understanding Fourier Transforms. I know that they transform a function from the time domain to the... Feb5-13 06:42 AM pellman 1 530 Is it possible that an electron of the 2s orbit fills the gap in 1s after electron capture? i believe no and it has... Feb5-13 02:54 AM sankalpmittal 1 447 One of stokes relation is that r=r'. What does this mean exactly? Is the phase difference between incident beam and... Feb5-13 02:51 AM sankalpmittal 1 493 Most textbooks list the real part of the index of refraction. How would I go about calculating the imaginary part of... Feb5-13 01:54 AM DrDu 1 637 Hi Guys Wondered if you could help me. Say a high energy electron (low wavelength?) is fired through an... Feb4-13 09:43 PM phyky 6 1,629 As far as I understand it... Each satellite transmits a signal that the receiver receives. This signal consists of... Feb4-13 08:13 PM davenn 3 645 It is usually written that the speed of light in a dielectric medium is ##v=\frac{c}{\sqrt{\epsilon_r}}##, where ##c##... Feb4-13 05:37 PM WhiteHaired 2 1,100 If you have one high energy photon and you collect it together with another, does there energy combined into one high... Feb4-13 03:47 PM big_bounce 8 484 Why is charge a derived quantity???? Feb4-13 03:09 PM mc2_phy 6 925 I was wondering what voltage or current, if any, would be produced if the basic magnet through a copper coil ... Feb4-13 02:57 PM mfb 1 461 Hey all, Anyone know if there is a δt to Compton scattering or is it an instantaneous event, entertaining classical... Feb4-13 02:31 PM IxRxPhysicist 4 540 what is the relationship between these 3 Charge Capacitance voltage?????? Feb4-13 01:45 PM AbsoluteZer0 2 507 Physics noob here. I was wondering, is there a way to measure time delay between the movement of one part of an atom... Feb4-13 12:33 PM ZapperZ 5 572 I was wondering if anyone would have a link to, or have, a diagram showing light wave diffraction at an obstacle? ... Feb4-13 11:19 AM jtbell 3 589 Hello Can someone explain what it is about typical household mirrors (eg. for grooming use) that allows them to... Feb4-13 10:42 AM Alkim 9 940 Hello all. This is my first post and I wasn't exactly sure where to put it, so I apologize if it could be in a better... Feb4-13 10:26 AM Andy Resnick 2 697 Hi, I am doing an university project that consists in building a robot that operates in a AC to DC convertor. The... Feb4-13 10:08 AM sophiecentaur 12 972 I was watching a video on YouTube called 'How Much Does A Shadow Weigh?' and towards the end, the following question... Feb4-13 09:02 AM russ_watters 16 1,670 If we had the capacity to measure masses this small: Would a candle in a closed jar be just as heavy as identical... Feb4-13 04:03 AM A.T. 5 504 To find average velocity, you do total displacement over total time To find average speed, you add up the speeds /... Feb4-13 02:06 AM NascentOxygen 4 529 I am looking to do some experimentation with x-ray imaging of non-living materials, and need advice on how to do it... Feb3-13 10:56 PM Drakkith 3 409 how do i wire this disk with the detectors Feb3-13 05:25 PM CWatters 1 419 A string with a density/length of rho and tension T has an elastic spring with stiffness k at x=0. There is a step... Feb3-13 04:12 PM artongue 1 448 What is the difference between the two ? Maybe that in the photoelectric effect all of the energy of a photon is... Feb3-13 02:57 PM Graniar 8 1,186 Energy gravitates. Is is so simple as to replace M in gravitational euqations with E/c*c ? ... Feb3-13 01:10 PM Khashishi 4 380 The width of a pulse is typically given in the time domain, correct? The effective width is the term to describe this.... Feb3-13 12:48 PM Alkim 3 346 Hello I have some questions regarding the following problem: Imagine I have a glass beaker partially filled with... Feb3-13 12:37 PM Alkim 4 636 Hello, I'm trying to analyze the RC circuit... specifically a low-pass filter, so the set up is voltage source to... Feb3-13 11:07 AM schaefera 4 424 If a ball is thrown upward with velocity of 1m/s, is vx = 0 while vy= 1? Feb3-13 10:28 AM sophiecentaur 5 412 why is it a derived quantity? Feb3-13 10:17 AM Drakkith 6 762