Levels Definition and 499 Threads

From what I have been reading, the reflection of light from an object, like th eyellow color of sulfur is the same phenomenon as Rayleigh scattering. It seems that the electrons receive the incoming photon and are raised to a higher "virtual energy state." When they return to the ground state...

Im doing a paper on Bohr Energy levels and I need help. The most I can find about the Bohr models are about its radius, velocities, and such. Is there any links that can explain to me clearly the whole concept of the energy levels and all equations attributed with it, if any.

I'm supposed to calculate the rotational energy levels of NH3, which is a symmetric rotator. The rotational energy levels are determined by the equation EJK = hcBJ(J+1) + hc(A-B)K^2, where J = 0, 1, 2,..., and K = 0, +/-1, +/-2,..., +/-J I don't quite get it. Are there a very limited set...

Question 15. (a) Show that the difference in decibel levels, B1 and B2, of a sound source is related to the ratio of its distances, r1 and r2, from the receivers by B2 - B1 = 20 log (r1/r2) (b) A speaker is placed between two observers who are 110 m apart, along the line connecting them. If...

Hey guys, this isn't really homework but will help me on the exam and the homework too. We are working in the book, where you just get to electron structure, orbitals, configurations, etc. The part that I need help with is Quantum Numbers. My book has: n(principal energy levels)...

I hope they have a plan to get our troops out of there if necessary.:rolleyes: They are asking too much from too few for too long. http://www.msnbc.msn.com/id/15220816/

Corruption at the highest levels, again. http://www.nytimes.com/2006/09/29/washington/29abramoff.html?_r=1&ref=washington&oref=slogin

Solving the Schrödinger equation in spherical coordinates for a diatomic gas, one finds that the rotational energy leves are given by: \epsilon_l=K\cdot l(l+1) where l=0,1,2... is the rotational quantum number and K is a constant. It is said that each energy level shows a degeneracy of...

Hi guys, I've got a little conceptual question here. I became a little confused after my exam. Firstly, I understand that in the photoelectric effect, the electrons either accept all or none of the energy from the particular incident photon and the photon must have a minimum frequency...

Hello all, I wonder if anyone can help me with a problem I don't understand about atomic levels. Given an excited state of He with electronic config (1s,2p), I need to find all possible atomic levels. The answer sheet lists 4 levels: 1) S=0, L=1, J=1 2) S=1, L=1, J=1+1=2 3) S=1, L=1...

"primes" as Energy levels...(eigenvalues of a certain operator) I have heard about the Riemann Zeta function to be some kind of physical partition function..my question is..could we consider primes as "Energy levels" (eigenvalues) of a certain partition function or operator?..in the form that...

Finished A Levels! yay:biggrin: now i have to wait over a month to get results , hmm.(im sure like many of u) bit sad to leave skl tho :frown: i'll miss the place, friends, teachers, familiar faces. anyway wish me luck, I'm aiming for... A,A,A,A* and distinction(I wish(!) made a lot...

how can we directly demonstrate the existence of energy level within an atom??

The diagram shows some of the energy levels of an electron in a mercury atom. Level Q represents the lowest possible energy level. (a)Explain why a line spectrum results from an atom with such energy levels. (b) Calculate the energy change in joules when the electron moves from level...

For a 1D infinite well, The energy levels of an electron trapped inside is dependent on the length of the well. The longer the length, the less its energy will be for each state. I am aware how the formula is derived. The main form of the formula is a solution of Schrodinger's equation which...

ive done a test were, i get someone to try and distinguish to lines that are 0.25mm apart from varying distances. then I am going to do some kind of calculation to tell me somthing (hopefully) and i have done this experiement in different light levels, controlling the lux. and i have...

The question is: So I have the equation to find the energy in an infinite well… \[ \begin{array}{l} E_n = n^2 \frac{{\pi ^2 (\hbar c)^2 }}{{2mc^2 L^2 }} \\ L = 2*10^3 nm \\ m = 5.11*10^5 eV \\ \hbar c = 197.33eV*nm \\ \end{array} \] Using this, I find n=1 to equal...

Hi all, would someone tell me how to calculate work done? We did this ages ago in school, but I can't seem to remember how to do it. There was also other things, but all I can remember is something like force x mass divided by something... sorry. :blushing: If anyone has the faintest clue what I...

hi, I've just done an experinemt to try and show the resolution of the human eye in different light levels. i did it by putting a 0.25mm apart slits in a tube then, behind it had an adjustbable light, then i moved the slit further back, and asked them to say if they could see the two slits...

hi, i need help in understanding something on sound. if admam works near a jet plane that is taking off and experiences the sound level of 150dB. then the protectors to reduce the sould level to that of a chain saw, what decrease in dB is needed? i think it's 40 but i am not sure. and also if...

Can someone help me with the following questions (I have no idea where to begin in either case). There are no questions that follow these same types of concepts in the book problems. 1) A 6000 Hz tone must have what sound level to seem as loud as a 100 Hz tone that has a 50 dB sound...

Hi: a) an atoms electron is in the ground state (4.11*10^ -17). An electron with ke 5*10^-17 collides with the atom, what happens to the energy. b) What could subsequently happen to the electrons in the higher energy levels help please

If an atom has a ground state energy level of -10.4eV then why is the ionisation energy 10.4 x 1.6 x 10^-19J ? Wouldn't that amount of energy just cause the electron to move to the highest energy level? I would have thought that the energy required to ionise the atom would be any value greater...

I am currently in Cal AB and will hopefully study through Cal BC this year. I am raelly interested in Quantum Mechanics, Relativity, and String theory. I just wanted to know what level of math I will need to study Quantum, relativity, and string theory in depth. Like Diff Q's, Partial...

I didn't really know which thread to post this in... I am currently in Cal AB and will hopefully study through Cal BC this year. I am raelly interested in Quantum Mechanics, Relativity, and String theory. I just wanted to know what level of math I will need to study Quantum, relativity...

Let consider this small example...I find it interesting, but I think it does not in fact tell anything about reality : You are in presence of somebody, and another one enters the scene :Operation "times" : a) subjectively (as seen from you), the number of person is for you : x 2 : 1...

Hi Guys, Because of the absorbtion and emmision spectrum we know that atoms have quantised engergy levels. For example for an electron to jump from ground state to the first excited state in a Mecury atom, a photon with the exact energy of 4.9eV is required. Now my question is what would...

Hey guys I was wondering something probably very simple. Would I be able to determine the force something has been applying if I simply know its final kinetic energy and displacement? And I remember this one equation where something = Integral of F * dx. I swear I am forgetting everything...

if scientists are good at analyzing situtations, why aren't their EQ neccesary all that great?

My instructor was telling what would be on the upcoming test and he said something about:Given the velocity of an electron, the work function of a certain metal, and final energy level. We should be able to find the intial energy state. Sound pretty easy... to easy but here is what i was...

Where can I find the different energy levels (in eV) for Li (2+). I can't seem to find it in my textbook or on the internet.

All the articles and books I have read conflict with one another in safe levels of Gauss. I understand the Human limit is 2000 Gauss. Does anyone know what levels of Gauss are acceptable for everyday exposure? As I said, all reports I have read conflict one another.

I know this may sound extremely silly... but, all ice at the north pole is floating... creating mass that would make the ocean higher than it would be... would that ice not be there, when ice melts it takes up less volume than when it is frozen? How would the north and south poles melting raise...

I need to know: In a closed system sealed off from outside air, if water from a mass of basic water evaporates, will the pH of the air be affected? If so, when the air condenses, how wil the pH of soil in the closed system be affected? Thanks for the help.

Number of energy levels... I have been told that as were go further away from the nucleus, the energy levels get closer and closer together - do we get to a stage where we get no more? I assume we must because any energy above this causes the substance to ionise (ie the ionisation energy); but...

Bodies with high molarity of salt (salt levels) cannot sustain marine life? but why? please help. thanks!

In a post below relating to Hawking radiation, Chronos linked to a page that expressed the existence of virtual pairs as a product of energy and time limited by the Heisenbug uncertainty principle: \Delta E\Delta t\geq\frac{\hbar}{2} This simplified view neatly illustrates one of the...

How do I calculate the number of electrons with a given energy in a sample of hydrogen atoms at a certain temperature? For example how many electrons would be in the n=2 level at 3 Kelvin? And does it matter whether or not hydrogen is gas or liquid or solid i.e is a different calculation...

A recording engineer works in a soundproofed room that is 43.5 dB quieter than the outside. If the sound intensity in the room is 1.00 10-10 W/m2, what is the intensity outside? Here is how I THINK I should be solving this problem. Intensity level = 10dB * log ( I / Io) Intensity...

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

When radiation with a continuous spectrum is passed through a volume of hydrogen gas whose atomes are all in the ground state, which spectral series will be present in the resulting absorption spectrum? Where do i even start?

Are rotational energy levels of a molecule in general equally spaced or does the spacing increase with energy? How about a diatomic molecule; I have seen a derivation showing that the rotational levels in a diatomic molecule are equally spaced, but when drawn in an energy level diagram they...

i am having problems with the atom model part of physics, i know that the current model stats the electron location is a probability and all, its when i get to the wavelength and the energy, with all the ionization and the spectrums that i don't understand... how can i find the energy level...

Imagine two capacitors charged at the same voltage. Now, connect one of them to a high frequency switch, and then to the primary of a 1:100 transformer. On the secondary of this transformer, there is a diode bridge, and then, the second capacitor is connected. Will the voltage of the...

http://arxiv.org/abs/astro-ph/0401198 How many cosmological parameters? Andrew R. Liddle Astronomy Centre, University of Sussex, Brighton BN1 9QH, United Kingdom 29 January 2004 ABSTRACT Constraints on cosmological parameters depend on the set of parameters chosen to define the...

I have very little training in the area of Physics, but enough to understand most of what is said on this forum. This is a first time post. My question has to do with gravity on an atomic level. This question is for those of you familiar with trying to combine all four natural forces...

I have very little training in the area of Physics, but enough to understand most of what is said on this forum. This is a first time post. My question has to do with gravity on an atomic level. This question is for those of you familiar with trying to combine all four natural forces...

What is considered dangerous energy of EMP to blow away electronics equipment at 1m distance? How does concrete wall change that? And if concrete wall has metal rods in it? Can EMP be directional? ps. Any pointers?

Often times, the religiously drowned population, as well as just non-science people with honest intentions, like to use the word "theory" against a scientific concept. Let's face it, outside of the scientific community people know not a thing about science. To be widely considered a theory in...