Electronic Definition and 422 Threads

Those of you who have worked retail may be familiar with the electronic counters stores install on doors to count the traffic entering and exiting the store. I'm working on a project to improve the quality of the shuttle system at my university. I want to measure all the important aspects of...

Is there a defined change in the electron orbitals of atoms as they transition from one state to the next? Is there a connection between the average kinetic energy of an atom, its electronic structure and its state of matter?

I was reading all over the place that graphene has some really great electronic properties that could potentially replace silicon, electrons in graphene behave almost like massless particles etc. My question is, HOW did scientists find out these properties in graphene? What kind of experiments...

Homework Statement A voltage - potential difference- is really just a measure of how badly electrons want to go from one terminal to the other. By connecting a wire, we create an E-field within that wire - the only path. Now my problem is, I used to think a battery - a source of voltage...

Now it's my time to choose my major,I will choose from Civil Engeering and Electronic Engineering.In my university,Civil Engeering College is better than Electronic Engineering College,I may get a higher salary if I choose the previous one,but the work may be tougher(I may stay at a very remote...

development of microwave technology enhanced the the used of ferroelectric materials. how to relate the growth of grain size with polarization and also effect on resonance frequency.

Need some help guys https://www.physicsforums.com/attachment.php?attachmentid=32237&d=1297816285 I began to analyze it and I got to this: OA2 is a non inverting amplifer OA1 is a voltage follower thus: V1(1+ (R1/R2) is the input for R3 into the final op-amp OA3 which is an...

Hi hope someone could help me understand the workings of electronic components. I think I am right in saying that all electronic components require energy for them to function. If you connect a battery to the component to supply the energy then this is supplied from the electrochemical...

I'm conducting an experiment to determine the brachistochrone. The setup is going to involve an inverted cycloid shaped track about 5 or 6 feet long. I need a way to measure the time it takes for a marble to roll down the track and I need a more accurate method than manually operating a...

Hi, I'm designing and building a mobile robot, however I have to find / design a circuit board that incorporates two motor outputs, and possibly 8-12 sensors. The circuit also has to be a PIC, to allow me to program the robot to carry out specific tasks autonomously. I have 0% knowledge on...

term "ground" mean in an ELECTRONIC circuit? What does the term "ground" mean in an ELECTRONIC circuit? A bus strip usually contains two columns: one for GROUND and one for a supply voltage. What does ground mean in this context and how do we ground a circuit while using a breadboard?

http://img707.imageshack.us/i/electronicsoscillator.jpg/ Dont know where to start for showing voltage difference at input is zero, suspose its something to do with non idealities of the op amp? For the oscillator question , kinda know how its works; there's positive saturation giving...

Wich school is best to choose if you want to become electronic technician? Degree too? Thank you.

Hi, I will be volunteering my time helping my professor in the realm of "electronic packaging." There doesn't seem to be a lot of straightforward tutorials on electronic packaging, could anyone guide me with the proper resources so I can take a look? Thanks Carlo

i wonder if anyone can tell me the meaning of "The Barkhausen stability criterion is a condition to determine when an electronic circuit will oscillate." in this what is the meaning of an electronic circuit will oscillate? thanks

Hii, I was wondering whether there is any correlation between the energy eigenvalues of a single atom (say He) with the electronic band structure of a collection of He atoms. for example, for He atoms the lowest energy would be the ground state, with 2 electrons. So will the lowest band for a...

Hi I have questions related to the electronic configurations of elements of d and f-block. First I want to ask a question about the E.C. of Lanthanium. This element has E.C. [Xe]5d16s2, but according to Bohr-Bury rule 4f-orbitals should be filled prior to 5d-orbital and then Lanthanium’s E.C...

Hi all. I have a question that I am thinking about for a couple of days. Let's consider the time-independent Schroedinger equation for a molecule: H0 [psi> = E0 [psi> Now, we know that the unperturbed Hamiltonian consist of electronic kinetic energy operator, electron-electron repulsion...

Hello forum members, I got a nifty new multireference CI program at my hands and now I'm wondering what to do with it. The program is able to correlate general MCSCF wave functions, and as such basically any kind of molecular electronic structure imaginable; in particular also electronic...

so I am starting to work on research in electronic masking... What applications of this topic could I draw a hypothesis from? I'm having trouble finding a potential hypothesis/thesis topic. Thanks!

Let's consider we have a crystal and we search the energy relation of the bands as function of the reciprocal lattice vectors. We would do that theoretical by applying the Tight-binding method. Let's consider that each band is associated with some kind of orbital ( for instance, 3d orbitals). Is...

Homework Statement A certain laser outputs pure green light (photon energy 2.5 eV) with power 500 milliwatts (0.5 watts). How many photons per second does this laser emit? Homework Equations not exactly sure, I know that Watts are equal to Jouls/sec and that the electronic energy of a...

Why is something like Fluorine written as 1s^{2}\;\;2s^{2}\;\;2p_{x}^{2}\;\;2p_{y}^{2}\;\;2p_{z}^{1} and not 1s^{2}\;\;2s^{2}\;\;2p_{x}^{2}\;\;2p_{y}^{1}\;\;2p_{z}^{2}? 2p_{y}^{1} and 2p_{z}^{1} should be of the same energy, right? Or is it only a matter of convenience/convention which one...

Hello... This is my last year in the field of electrical engineering and i want to work in electronic desgin or pcb design at home for some companies or some one... Is it possible to do so and if yes do anyone has emails or websites to contact these persons Thank you

This may be a really dumb/easy question, but... I have a computer fan that I'm trying to repurpose. The specs on the fan say DC12V, 0.25A. I'm trying to model the fan in a circuit diagram because I want to 1) make sure i don't put too much current through it and 2) add a potentiometer to it...

Can anyone please explain me what is difference between Full Authority Digital Engine Control and ELectronic engine control in an aircraft gas turbine Engine ? What all parameters are controlled in EEC and FADEC ? What is the main difference ?

Homework Statement We've a task to make a electronic projects using only resistors,diodes and capacitors and a supply , what could we make out of these parts ?? The Attempt at a Solution I've searched over internet for 2 days and found 100 of projects but all of them are very...

Hello, I am a sixth form student studying physics and I am planning on doing a project on electronic analog computation and I am stuck as to where I should begin to learn how such a system solves problems (without delving too much into too many details). I have limited knowledge on electronics...

Hi! I am writting my labbraport on electronspektrum for natrium atom. Here is my electronic transitions but the teacher says that there are some transitions missing...have no clue which ones they might be...can someone explain to me what is he talking about? which are the missing electronical...

Someone please tell me if I am thinking right: Let's consider an unperturbed electronic state of an atom/molecule. If we denote it by [a>, then the average electronic momentum in state [a> is, <p> = <a]p[a> = (<a]p<a])* (because p is hermitian) = (<a]*p*[a>*)...

Hello, I am looking for recent info/studies on electronic packaging costs. I focus on the extreme cheap type of packages (e.g. SOT23). In general it nails it down to low I/O PLCC. A study on components sold in this type of package form is interesting too. Story on cheap LEDs interst me...

Hey all. So, I understand that every bound electronic state will have zero average electronic momentum, because otherwise the electron will fly off the atom. But how do I show mathematically that < p > = 0 for any bound state. Any help or reference greatly appreciated. Thanks.

this one comes out of my homework question. I am not asking you guys helping me doing my homework, i had a thought but didn't work at all and i hope someone can tell me what is going on. question: Suppose the magnitude of the proton charge differs from the magnitude of the electron charge by...

1- upon getting sufficient energy, electrons make transitions in between their orbits. suppose an electron, from the first orbit, is provided energy that is enough for it to settle down some where between 3rd and 4th orbit, will it make an orbit of its own there if the source of energy does not...

I have seen most people say electronic dictionary, diary etc. I often confuses the terms. Since long time I have referred to my handheld Franklin dictionary as digital dictionary. Am I wrong?

Hi all. This is my first post @ physics forum. For last two weeks I have been wondering about this problem: We all know that an atom or molecule subjected to a time-dependent perturbation makes electronic transition, and whether the transition is allowed or not depends on the transition moment...

i need advice, i want to go into a career in research engineer. i would like to do either electronic or mechatrionic engineering but i don't know if it would be better to just go into one field of engineering(electronics) which cover one subject in dept or two separate fields of...

Hello, I'm not sure if this is where I need to be, but here goes. I have a Currie 24 volt ESC for an electric scooter, I also have a generic one that is 36 volts, both work perfect, my question is the 24 volt is built much, much better than the 36 volt, what I would like to do is swap the parts...

This seems like such a simple question and I feel like an idiot asking it, but here goes: If we have a hydrogen atom (not molecule) at "rest" and we shoot an electron at it with a certain known energy, what could happen? To me, it seems as though there are two distinct outcomes; either the...

How can I tell, with an electronic configuration, if an element is in ground or exited state? Also, how can I determine what element it is if it uses a noble gas shortcut? I assume I find the noble gas in brackets, count the atomic number, add it to the elec config outside of the brackets, and...

I have several electronic spectra for different cobalt complexes which I need to analyse. I am fine with finding \lambdamax and the molar absorption coefficient etc. However it also asks me to mark absorption bands on the printout and tabulate \lambdamax values and absorbance values for these...

Can anyone help me?

Does anybody know of any online source for Electronic Engineering and Computer Engineering? I've only been able to find http://www.ece.mtu.edu/faculty/ljbohman/onlinetext/elint200.pdf" I suppose a real book would be fine too.

Electronic Supply sites make me cry :( (A switch-related question) Ok so I've been going through Newark's site, trying my darnedest to find a tactile switch that A: does what I want, and B: has plastic switch caps of some kind that fit. To address item A, I need a tactile button that is...

Hi Experts, I would like to make an electronic circuit to control AC power to switch on and off a light bulb based on sensor. Being new to this , i hope know what aspects i need to pay attention to when using DC to control AC? sincerely Ramone

I'm taking a graduate course on computational physics which has a project. I'm doing research on electronic properties of graphene, like quantum hall effect measurements. So, I want to do the project related to my research. The project shouldn't be too difficult, as I haven't done simulations...

Hi, I wish to do math equations electronically. Can someone help me to find a good software? I heard there is such a thing called latex. Where can I find it? Thanks

Dear Experts, I opened up a small radio about the size of thumbdrive. The circuit is so small. Is there a way to shrink a 555 timer chip which is so big compared to that radio? Radios should require transistors right? But I could not find the usual size transistor on this radio...

What kind of career opportunities are there for EE graduates which are dynamic, have decent pay and not repetitive?

here is my problem. Galium Nitride is an Ionic Compound. Work out the electron arrangement of the Nitrogen ion