Levels Definition and 499 Threads

Is there research or data that measures the penetration of various visible light colors on the human body?

Is the ground state always most probable state of the system? For example in problem of LHO or potential well?

Homework Statement Calculate the wavelength of the electromagnetic radiation emitted when an electron makes a transition from the third energy level, E3, to the lowest energy level, E1. Homework Equations E_n = \frac{\left (n_{x}^{2}+n_{y}^{2}+n_{z}^{2} \right) \pi^{2}...

Using the NIST database, I get the following energy levels for Ne^9. But there some some values missing (where the ? is shown). Any of you know these numbers, or where I can find them? Thanks. 1s2 1S 0 0.00000 1s2s 3S 1 7299940.0 1s2p 3P° 1 7379327.8 1s2s 1S 0 7382680.0...

Hi, I am looking for electronic excitation levels of molecular hydrogen like attached table. but there are only a few electronic states, i need near-threshold energy levels. where can i find all levels? thanks for attention http://imgim.com/5648inciz1637947.jpg

Homework Statement In the hydrogen atom, the electron jumps from the n = 1 level to the n = 4 level. a. During this transition from n = 1 to n = 4, is a photon emitted or absorbed? b. What is the change in energy of the electron? c. State the transition in words. d. What is the wavelength...

Homework Statement So I'm stuck on part (ii) where we have to solve the rotational energy levels. Problem: http://screencast.com/t/9rZStJdG3wJ The answer is ii) 0, 3.84 cm-1, 11.52 cm-1 Homework Equations Equations: http://screencast.com/t/ubFEheGBz The Attempt at a Solution...

Hello Guys, I am new to this forum, but have recently fallen in love with physics and maths. I am an international baccalaureate student, who studies maths, and was wondering whether any of you could suggest any books to help with a certain kind of problem. At the end of our papers...

Hey, I am trying to figure out some research for a department at school, and need some chemistry info. Basically, I am comparing D2O (Heavy water) HDO (Semiheavy water) and H2O (Light water) NOW... each of them have different pH levels. What does that mean that they each have...

Homework Statement If E1≠E2≠E3, what are the new energy levels according to the second-order perturbation theory? Homework Equations H' = α(0 1 0) (1 0 1) (0 1 0) ψ1= (1) (0) (0) ψ2= (0)...

Why does the Fermi level level drop with increase in temperature for a n type semiconductor.? What's the basic idea behind Fermi level? How does it get affected by temprature?

Homework Statement Determine the longest wavelength of light emitted from this atom. Homework Equations \lambda=\frac{hc}{E} The Attempt at a Solution I calculated the lowest energy of the light emitted: E_{min}=2.1(eV) Then the longest wavelength would be...

All right, I'm planning to sit A level exams this January, I've been persistently studying the subjects but I'm not sure what the fees are. I'm applying rather late because I've found out where I can sit the exams by coincidence when I was losing hope of ever finding any information on the...

Based on Fermi distribution, if there are two electron energy levels with occupation possibility of ¼ and ¾, respectively, calculate energy difference between these two levels.

Homework Statement Now , I Will Begin by stating the calculation and i will post the query at the end. so here we begin, we know that If W is the work done by a conservative force, potential energy change is given by: ΔW= - ΔU ...(1) ie when work done by conservative force is positive...

I'm curious about food preservation. Which are the most common dangerous bacteria? How quickly do they grow? What sort of conditions? And how many must be present to pose a threat to a human? Also, how do they survive the stomach? Do they infect via the mouth or esophagus?

Does anyone know why quantum states exist? In other words, is there an explanation for why the universe is built from discrete levels vs. some other system? I've scanned over numerous books on quantum mechanics and the history of quantum mechanics but I can never find a layman's answer to this...

I'm applying to Cambridge Maths. Will I be disadvantaged if I only take 3 A levels and no additional AS? I have no GCSE equivalent as well.

Today I did the usual thinking, watched some courses online etc. and found out(or rather reminded myself) that the EM waves can be produced only when a charge oscillates.(or that's what the professor at Yale said) But then I remembered LED diodes, and their ability to emit light. Electron...

Today I did the usual thinking, watched some courses online etc. and found out(or rather reminded myself) that the EM waves can be produced only when a charge oscillates.(or that's what the professor at Yale said) But then I remembered LED diodes, and their ability to emit light. Electron goes...

what are atomic energy levels? are they different in principle to electron energy levels? how to visualize atomic energy levels in any substance (solid, liquid and gas) I have read that during the formation of bose einstein condensate all the atoms comes to ground level from high energy levels...

Will they rise slow and gradual allowing for a somewhat seamless transition of population to higher ground, or will there one day be a large storm that will inundate an area permanently? What are the implications for the gulf coast, South Florida, and the East Coast? How will vital...

HI! i only know about the basics of current and electricity , but, i wanted to ask this.. the drift velocity in electrons is approx 10^-4 and thermal velocity is 10^6 m/s , which is not very large compared to the length of wires connecting power stations and homes , but still we get...

Homework Statement Find the eigenfunctions (with angular momentum 0) and the estimation of the 3 first energy levels (given g and a) of a particle in a exponential potential such as V = -ge-r/a Homework Equations Time independent Schrodinger equation (SE)The Attempt at a Solution Did a...

Hi physicsforums, I know I have posted this before but i want to consolidate whatever I have learned from the amazing tiny Tim into a single post to conform the simplified concepts. Thanks! These are derived from here: In particular, the friction from the road on the driving or braking wheels...

Homework Statement Particle of mass m in a 1D infinite square well is confined between 0 ≤ x ≤ a Given that the normalised energy eigenfunction of the system is: Un(x) = (\frac{2}{a})\frac{1}{2} sin (\frac{nx\pi}{a}) where n = 1, 2, 3... what are the corresponding energy levels...

Hey guys, A simplified diagram for the energy levels involved in Nd:YAG laser can be found here: http://upload.wikimedia.org/wikipedia/commons/6/69/YAG2.svg Two (short) questions: 1. Selection Rules The lasing transition happens between ^{4}F_{3/2} and ^{4}I_{11/2}. In the process J (of the...

Hello forum members... I have a problem in calculating the energy of rotational levels. Kindly help me...The question goes like this: A Caroussel(merry-go-round) of diameter 20 m and weight 1 ton( =1000 kg that is evenly distributed on the discs) rotates 10 times per minute. Calculate the...

Hi there, my comparatively ignorant mind is wondering, When an atomic transmutation occurs all of the quantum levels of the new atom also change 1) what is the actual rate of this change? would a nonplayer "observer photon" passing near the suddenly different element note the quantum level...

Consider a universe where the intrinsic spin of the electron is S = 5/2, but all other parameters and Rules of Quantum Mechanics are the same. Find the degeneracy of the n=1 and n=2 levels of hydrogen. My understanding is that electrons in an atom have 4 quantum numbers n,l,ml,ms, and different...

What is the current state of things? Are they fairly confident that the Higgs exist despite more data being needed for the 5-sigma confidence level? Could it still (realistically) turn out to not exist?

Hello ! I had my fair share of quantum mechanics already :) But today I was wondering something, kind of odd I thought of this so late ... But do continuous energy levels really excist or is it just an approximation. I am asking this cause by my understanding energy is quantized, so...

Homework Statement In a set of experiments on a hypothetical one-electron atm, you measure the wavelengths of photons emitted as electrons return to the ground state (n=1), as shown in the energy level diagram. You also observe that it takes 17.50 eV to ionise this atom. Diagram shows...

Homework Statement i want to check out which material of pipe vibration level higher . comparison between pvc pipe and nylon pipe. nylon pipe is more soft and flexible than pvc pipe. which one vibration more ? Homework Equations The Attempt at a Solution

I'm trying to work through the below problem but it is a bit tricky and I would love any helpful tips: A boat with a lead block on it is sitting in a pool. On the side of the boat is a red line right at the water level. On the side of the pool is a blue line right at the water level. The...

maybe this question has more to do with chemistry, but it's physical chemistry at the very least. so, in physics class we have been learning about schroedingers equations for the H atom electron energy levels, and discussing bound electrons in a potential well. for these electrons to move up...

Hello, I am new to these forums. I am in Year 10 and have decided to take Physics and Maths at A level. However, I need to choose 2 more A levels and have considered Further Maths and Chemistry. I would like to take Chemistry because I love science! But I'm worried there will be too much...

It is known that a process occurs with a frequency of 10 events per second and a second process with a frequency of 12 per second. Consider the two situations: 1. It is possible to repeat N times the experiment, that consists in counting the processes, over a period of 10 seconds. 2. It is...

Homework Statement Calculate the energy splitting of the magnetic sub levels of a 3S1 term in a magnetic field of 1.5 T. The Attempt at a Solution From the term symbol 3S1 I can conclude: S -> L=0 subscript 1 -> J=1 superscript 3 -> 3=2S+1 -> S=1 Therefore I have two electrons with spin +1/2...

Do you know the corresponding years of experience range for Intel pay grade level 7, 8 , 9

Deduce the formula giving the energy levels in terms of n for a free particle in a box of length l, using the fact that only stationary waves can be occupied by the particle. - considering stationary waves, λ = 2l/n. (1) 1) Using E=hv/λ= hvn (2) And P = h/λ, v = h/m*λ, v = hn/2ml (3)...

hi, why are the energy levels of electrons in say a hydrogen atom -13.6ev, -3.4 eV etc ? i thought energy is always positive? what does the negative mean? thanks!

μ/T represents the change in entropy if we change the number of particles,, so according to the fundamental assumption of statistical mechanics μ/T should tell us about the tendency of two systems to exchange particles... but I am having a hard time imagining how rotational or vibrational...

Homework Statement Determine the no. of energy levels with different values of total spin for a system of N particles with spin 1/2 The Attempt at a Solution Let f be the no. ways to get a z projection of spin, then f(\sigma )=Binomial(N,\frac{1}{2}N + \sigma) Where Binomial(a,b) is a chose b...

Exchange splitting of energy levels of a system?? Hey guys, I was just reading my QM book and came across this; Homework Statement Determine the exchange splitting of energy levels of a system of two electrons, regarding the interaction of the two electrons are a perturbation. My...

I don't get why for hydrogenic atoms the 2s and 2p orbitals have the same energy. i do get it mathematically, but I am thinking that the fact that there are angular nodes in 2p and not in 2s MUST affect the energy!

Does anyone have explanation, or can point me to papers explaining this thread title? Personally, I did some reading through years, but I could never find an answer to this question. In short, here is what I learned so far: Oxygen: - in free form, is a product of photosynthesis of...

Homework Statement Given that a 95% confidence interval (or 0.05 significance level, α=0.05) for population proportion p is (0.11, 0.17), which statement is true regarding the hypotheses: (null hypothesis) H0: p = 0.15 (alternate hypothesis) H1: p ≠ 0.15 a) Reject H0 at α = 0.05 b)...

Does molecular vibrational transition and consequent emission of infrared radiation involve electrons changing energy level? In wikipedia, about vibronic transitions it says "Most processes leading to the absorption and emission of visible light, are due to vibronic transitions. This may be...

Would anyone be able to explain s,p,d,f in detail without using complex math? Also quantum states such a m,l etc. or link me to a site/paper that does? thanks