Excitation Definition and 131 Threads

Here is a multiple choice question i was completely stumped on, and still can't find the right answer for in my textbooks... Name 2 forms of excitation with respect to synchronous motors: a) under and over excitation b) dc & ac variation c) dc excitation and load variation d) armature and...

I know as a fact that excitation (amount of current on the generator rotor) determines the amount of reactive power output from the generator. But why? How does it turning the excitation up or down influence the reactive power output? Thanks.

Hello there, Could some one help me to find equations of motions of this problem attached to this message? thanks a lot Niko

I just have a quick question. Which way of Atom Excitation is more efficient? Photon Energy which matches the absorption peak(s)? Or Photon energy of a Shoter wavelength than the absorbtion Peak?

Just wanted to ask a simple question to clarify my thinking. The Ionization Energy of an atom is said to be the minimum energy required to bring the electron to it's next higher orbit. Looking at the Oxygen atom's first ionization energy of 13.6eV. Does this mean that any energy level...

How is the absorption coefficient per unit path length determined for excitation sites in a host crystal with an excitation site density of N and a bandgap of the excitation site equal to the photon energy? What I am trying to determine is how many photons will be absorbed for a given length.

When we have vibration excitation then the radius of nucleus is define like: R=R_0[1+\sum^{\infty}_{\lambda=0}\sum^{\lambda}_{\mu=-\lambda}\alpha_{\lambda\mu}Y^{\lambda}_{\mu}(\theta,\phi)] where \alpha_{\lambda,\mu}=\alpha_{\lambda,-\mu} and \alpha_{\lambda,\mu}=\alpha_{\lambda,\mu}(t)...

I have this question about the nuclei can it excited like we do with the electrons of atoms Or in other word for example if the nuclei in the stat that is n=1, E=E(1) Can we excite it to n=2 ,E=(2) ….. and how what we use for this how we can measure it ...i think it will be a...

Another transformer question: if I have an oil-filled transformer coil and I calculate the turns ratio with voltage in / voltage out at 60 Hz, why, when I increase the frequency to 23 kHz would the turns ratio appear to change? Is it because of the inductance of the primary coil? My boss'...

hallo all, I was wondering the following thing: when using a He-Ne laser, you pump some energy in the system to get the He excited, but why only the He atoms? If you pump energy in the systems, wouldn't the Ne atoms get excited too ? (and I am not speaking about them getting excites because...

hello, everyone, I am not in this filed. So I get a simple question. Besides field emission and thermionic emission, is there any other means to excite the eletron and get electron beam. Could anyone tell me some basic similar ways to excite the ion and photon? Thanks.

Let's say, for ease of reference, an electron strikes a mercury atom with just enough energy such that this mercury atom is excited to another energy level. What would happen if a photon struck this atom with the same amount of energy? I remember encourtering a True/False problem like this in a...

Homework Statement Ok, I need to show that in an acoustic mode of vibration in a diatomic lattice, for small k, \omega \propto k, and find the constant of proportionality. Homework Equations A_1\left(\omega^2M-\frac{2T}{a}\right)+A_2\left(\frac{2T}{a}cos(ka)\right)=0 , and...

Hi, I had a question regarding excitation. If a photon is absorbed by an electron, and some of the energy is gained by the electron, which then moves to a higher energy level, what happens to the rest of the photon's energy - is a photon of lower energy, corresponding to the difference in...

How would you use excitation levels (or the lowest excitation level) to find the radius of a nucleus? And how would it differ to using the r=r0A^(1/3) formula?

What's the difference between an excitation spectrum and an absorption spectrum for the same molecule? Are the words interchangeable, or are they completely different processes? In Sharma, A. and Schulman, S. G. (1999). Introduction to Fluorescence Spectroscopy. Wiley interscience, it says...

Let's say I have a molecule with a carbonyl (C=O) group on it. Let's assume that the carbonyl group is positioned in a such a way that when we look at it the carbon is below the oxygen (so it's vertical). Therefore, it is stretching up and down. What would happen if p-polarized light (E...

Im a electrical engineering student. I am now trying to understand the operation of synchronous motor. I need helps from electrical professionals out there about the excitation system of the motor. can someone give me a circuit diagram of the exciter? any advice on the methods of...

What is the excitation energy of the He atom? I imagine this is also the energy of the photon released by the electron as it deexcites from the p orbital to the s orbital. I guess this would be different to ionisation energy as that refers to taking the electron away completely from the atom...

hello every one The thing I can't understand is 1) In He-Ne laser the He atoms in the excited state interact with the Ne atoms in the ground state how it is possible? 2) In all the textbooks they wrote that "atoms exite". Wil the atoms exite or the electrons? because to my knowledge atom...

I have been reading "Response of a Single Degree of Freedom System to Undamped system" and have been referring the book on Dynamics of Structures by Anil K. Chopra.I have got the following questions: 1) One , basic question I have is that the author says that an example of a harmonic...

Mass density is a 3-form, just like electric charge density. Hence it's exterior derivative is 0. This implies that there is a 2-form whose exterior derivative is the density 3-form. If this density is the electric charge density, then the name of this 2-form is "excitation" (D). But what is the...

Hello, I'm trying to decide how I will provide excitation voltage to the wheatstone bridge of a load cell. The output of the load cell will be amplified by an LT1167 In-Amp. How concerned should I be about the precision/accuracy of the excitation voltage? Since the In-Amp will reject common...

Is this for real? http://www.smh.com.au/news/national/laser-enrichment-could-cut-cost-of-nuclear-power/2006/05/26/1148524888448.html

for these problem: 1.calculate the K excitation voltage of copper. 2. calculate the wavelength of the Cu K(alpha 1) line. my problem: with that limited amount of information, how are you supposed to calculate it?

A typical stat mech. question is the following: If I have 5 bosons and energy E to divide among the bosons, what is the total number of possible configurations? I can't remember this answer, so if someone reading this can post it that would be appreciated. Now, I want to ask a slightly...

When a photon hits an atom it gets absorbed and an electron moves one or more shells up depending on the energy of the photon. When a bigger, many-electron atom gets hit by a photon, can the electrons in the lower shells get excited? I mean when they move up they have to remove the electrons in...

I'm trying to solve problem 9.1 from griffiths book on quantum mechanics. I've written down the hydrogen wavefunctions for all combinations allowed of n, l and m. Now according to griffiths (and my memory) only one excitation is actually allowed between n=1 and n=2. This would minimize the...

can anyone please provide me all the excited levels of Carbon 12 upto 22.6 MeV at least with jpi descriptions? Thanks in advance.

From a current v voltage graph, how does one calculate the excitation potential? I thought it was calculate the difference between peaks, take an average and this gives you the excitation potential? Is this right or is there a different way to calculate it? James

excitation, ionization, TEMPERATURE?? When atomic electrons are excited or ionized, do they contribute to temparature rise?? If yes, what energy of the electron is significant in this case??