Excited Definition and 174 Threads

Homework Statement In a hydrogenlike ion with atomic number Z, the energies of the allowed states are given by E(n) = (-13.6eV) (Z^2/n^2) What is the wavelength asociated with the transition between first excited state and ground state of hydrogen-like helium? (He+) Homework...

Homework Statement An atomic spectrum contains a line with a wavelength centered at 460 nm. Careful measurements show the line is really spread out between 459 and 461 nm. Estimate the lifetime of the excited state that produced this line. Homework Equations Change in Frequency =...

help please, for question: a hydrogen atom, initially in ground state, absorbs a photon, and is excited to its second excited state. What were the wavelength and the energy of the photon by the atom. Did i do it right. 1/λ = (1.097*10^7)(1/n1^2 - 1/n2^2) 1/λ = (1.097*10^7)(1/1^2 -...

Does the proton have n-pole excited states? Or n-pole excited states exist only for A>1?

Homework Statement Well,the problem is such : There are two hydrogen atoms.In each atom electrons were excited to the same energy level.Lifetime of one of the excited electrons is t1,when lifetime of other is t2. The question is : Which on of them had more wider spectral line,when during...

Hey guys, I'm an engineering PhD student, and I'm doing some work with laser-induced fluorescence. At the moment, I'm trying to understand some notation about the excited states of nitrogen dioxide. One of the papers I'm looking at, V.M. Donnelly, et al. J. Chem. Phys. 71, 659 (1979), is saying...

My book calculates the ratio of probability to find an atom in an excited state vs finding it in the ground state in the sun and gets approx 1/109. Essentially this must mean that the ratio of the multiplicities of the system must also be equal to this, i.e.: \Omega2/\Omega1 = 1/109 How...

QM says that states which are simultaneous eigenstates of two commuting observables are allowed. If you don't have such states to start with you can construct them with the Gramm-Schmidt orthogonalization procedure. Consider the excited states of a nucleus. (They can be considered eigenstates...

hi all. i am trying to calculate the interaction between two excited hydrogen atoms, using degenerate perturbation theory. but comes up a few problems, any helps will be greatly appreciated. the perturbation has the form: H`=e3/R3(XaXb+YaYb-2ZaZb) where the R is the distancee between two...

I was wondering why hot objects glow (such as a heated metal), what I found on wiki: "Thermal radiation is energy emitted by matter as electromagnetic waves due to the pool of thermal energy that all matter possesses that has a temperature above absolute zero. Thermal radiation propagates...

Can one go about creating excited states of a nucleus without using neutrons? For example, Aluminium 26 exists in a ground state that has a half-life of about 70000 years, and decays by beta particle emission. It can also exist in an excited state that decays with a half-life of about 6.3...

I've never heard of any excited states of the proton. Why? By "excited state" I mean something with the same composition (uud) that decays to the proton (plus photons etc.) with nearly 100% branching ratio.

I have a question that iv been stuck on for wile. I am in year 2, electronic engineering and I am having a little trouble with this. A separately excited shunt generator has the following nameplate data, 50kW, V(FL) = 125, R(A) = .01 ohms, R(F) = 16 ohms and an excitation voltage of 125 VDC...

hi i have a question about excited state: let me say you have an atom and then you use light to get the electron to a higher energy level. does this mean, that there is always a spin change, cause as far as i know the spin of a photon is 1. but what happens if you have an electron...

Homework Statement An atom which is in an excited state, can emit a photon with the wavelength of 330 nm at during the movement between two "energy niveaus". The last niveau has the energy -4.8 \cdot 10^{-19}J. What is the energy of the atom in the excited state? Homework Equations Not...

A few years ago I borrowed my friends camera and took these photos of one of my moms paintings. Close-up of the signature. Now compare to this signature. I got excited.

Neon has lowest excited energy at 1(s^2)2(s^2)2(p^5)3(s^1) state. And the excitation energy is about 16.9eV. And next energy is at 1(s^2)2(s^2)2(p^5)3(p^1) state. And the excitation energy is about 19eV. In Franck Hertz experiment with Neon, current decrease at every 19eV, no 17eV. Why...

We know in silicon a valence electron can be excited to conduction band if it absorbs one photon(one photon absorption) or two photon(two photon absorption),my question is that it must need a certain amount of time for the electron to 'travel' from the valence band to the conduction band(I...

If I look at physics threads here, I can find hundreds of people who want to do theoretical physics but not so many want to do experimental. Why is that? Most of the beauty in physics has come through experiments, after all. I especially liked the Cavendish experiment which was an awesome...

Homework Statement According to the energy-time uncertainty principle, the lifetime t of a state is inversely proportional to the uncertainty in the energy E. We consider the line λ= 656nm resulting from a transition in a hydrogen atom, from an excited state of lifetime 10-8s. (a) What is...

Homework Statement A separately excited DC motor with 220V, 970rpm, 100A and Ra=0.05ohms. It is braked by plugging from an initial speed of 1000rpm. I need to calculate i)the resistance to be placed in the armature circuit to limit braking current to twice the full load value, ii)the...

I am trying to prove the variational principle on 1st excited state, but have some questions here. The theory states like this: If <\psi|\psi_{gs}>=0, then <H>\geq E_{fe}, where 'gs' stands for 'grand state' and 'fe' for 'first excited state'. Proof: Let ground state denoted by 1, and...

When the electrons in silicon are excited by visible light and jump into the conduction band how do the electrons replace? So for example, wouldn't a solar cell only last for so long if all the valence electrons are excited and converted into current. I am looking at it as if all the valence...

As of this point. I understand the following. 1. there is almost 90% loss when applied to a laser system. 100 watts in 10 watt beam out. 2. when a beam is split there is also a loss, (amount unknown) 3. if you take a 20 watt beam and (with not loss) split it in two and cross the beams...

Homework Statement A particle is initially in the ground state of a one-dimensional infinite square well extending from x=0 to x = L/2. Its wave function, correctly normalized, is given by \psi (x) = \dfrac{2}{\sqrt{L}} \sin{(\dfrac{2 \pi x}{L})}} for 0 \leq x \leq L/2 Suddenly, the right hand...

A quick question... When you excite electrons or so in molecules, atoms etc., do the molecule/atom change, or what does happen ? I mean, if you have water, and excite an electron, do it turn from "liquid" to "gas", or the other way around, or doesn't it change its structure or what you can...

What determines the amount of time that an electron spends in an excited state before it drops back to its ground state? Is the attraction between the electron and the nucleus the cause? Would the electrons in heavy elements spend less time in their excited states? I'm conceptualising an...

I have a very basic question regarding mutual inductance. Consider a basic square loop with two coils wound on opposite sides from each other, with coil one excited while coil two si left open circuited. The total flux linking coil 1 is Φ11 = Φl1+Φ21 where Φ11 is the total flux...

Hi all, I'm doing some test prep for a Nuclear Physics course and working on a past paper. I've attached a photo of the question. The diagram is 3.19 in Krane. The course is based on Krane, and so the relevant chapter is Chp 5: Nuclear Models. Problem description The problem is to explain...

hi everyone, I'm a beginner in QM and I have a question. we know that when an electron is hit by a photon, it gains the photon's energy and goes up to the excited state. Here is my question: according to the compton effect, we can interpret the collision of a photon and an electron just...

Homework Statement 1. Homework Statement The temperature of the surface of a certain star is 8000 K. Most hydrogen atoms at the surface of the star are in the electronic ground state. What is the approximate fraction of the hydrogen atoms that are in the first excited state (and therefore...

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 been working on this question for quite a while. no help on google, or my textbook at all. A hydrogen atom in its ground state is excited to the n=5 level. It then makes a transition directly to the n=2 level before returning to the ground state. A) What are the wavelengths of the...

Homework Statement Rotation of a deformed nucleus is predicted to produce nuclear excited states with energies given by E(J)=J(J+1)hbar/2I. The first two excited states of 238 U are Jpi = 2+(0.045MeV) and Kpi=4+(0.148MeV). Show these energies are consistent with rotational excitation stating...

Homework Statement State wether atom is in ground or excited state. Homework Equations A.1s22s22p3 B.1s22s22p63s23p64s23d104p55s24d7 C.1s22s22p63s23p64s23d6 The Attempt at a Solution A. Ground because all are filled in order. B.Excited because the 5s sub-shell isn't quite...

Homework Statement How much energy is required to remove an electron from a hydrogen atom in a state with n = 8? Homework Equations E = - (1 / 4pi*epsilon_0)(me^4/2(h-bar)^2)(1/n^2) Where E is the total energy of the electron. The Attempt at a Solution I know that if you solve...

In neutron activations, target materials are being beamed by high energy flux, thus making the target materials excited and undergo radioactive decay. Neutron analysis then can be performed after the materials are "cool" enough by placing inside the hood with enough shielding. My question is...

Homework Statement A particle is in a quantum state defined by: \Phi(x)=0.917\Psi_1+0.316\Psi_2+0.224\Psi_3+a\Psi_4 where \Psi are the eigenfunctions for a particle in a box given by \Psi_n=\sqrt{2/L}sin(npix/L). The corresponding eigenenergies are E_n=1.5n^2eV What is the...

Homework Statement The ground state of _{6}Cl^{13} has spin-parity 1/2- and the next three excited states have values of 1/2+, 3/2- and 5/2+. Explain these values in terms of the shell model.The Attempt at a Solution The problem is that i don't know what is being asked of me...i initially...

1. In a certain gamma decay process, an excited neon atom emits a gamma-ray that has an energy of 1.630 MeV. The neon atom in the ground state has a mass of 19.992 435 u. What is the mass of the excited neon atom? 2. I am pretty lost here. There must be a formula relating these...

difference b/w excited satate and metastable excited sate?and why the time period for m.s.excited state is greater than the common excited state?and how a photon deexite the electron when it is interacted with electron in m.s.excited state? m.s.excite=metstable excited state

Hi Guys, :smile: In case of an Induction Generator (IG) connected to grid, the rotor runs at super synchronous (above synchronous) speed exhibiting -ve slip. This is possible since the grid frequency is fixed at say, 50Hz. However, in case of a Self Excited Induction Generator (SEIG), it...

Homework Statement a) To get a wave function for a situation in which the energy is close to E_0 and the atom is almost certainly in one of the minama of the potential energy , consider the functions \varphi_t(x)=[(\varphi_0(x)+\varphi_1(x))/(2^(1/2)))...

How is the energy of an excited electron sent to another adjacent molecule as in the photosystem of chloroplasts in plant cells?

Hello, Non-relativistic quantum mechanics doesn't explain why the electron in the hydrogen atom (for example) "decays" from excited states to the ground state. Which theory does explain this phenomenon (from basic principles) ? Thanks.

Excited state?? Homework Statement Initially a hydrogen atom is in its ground stat. An electron with kinetic energy 10.6 eV collides with the atom and excites it. What is the remaining kinetic energy of the electron? A. 13.6 B. 23.9 C. 3.0 D. .4 E. .6 the answer is .6 eV but not...

I have a question in regards to using gas to operate a closed system, To utilize the kinetic energy of the gas molecules to do mechanical work. Conventionally atmoshperic air has been used. The system (air) is pressurized to say 60 lbs and you may get 2 or 3 uses from that pressure. Let's say...

Homework Statement the nucleus of 227Th decays to 223Ra and \alpha. the daughter nucleus is left in a short lived excited state and decays down to the ground state with the emission of an 80 keV gamma ray. the natural line width of this gamma ray is .6 keV. what is the lifetime of the excited...

This is a question relating to Problem 7-1 in Modern Physics (5th ed.) by Tipler and Llewellyn. Find the energies E311, E222, E321 and construct an energy-level diagram for the three-dimensional cubic well that includes the third, fourth, and fifth excited states. How are these states...

Homework Statement I am asked to determine the most likely I\pi state for an excited 60Co nucleus (a 59Co nucleus that has just been hit by a neutron). I have determined already from the previous part of the problem that the excited state has energy of ~7 MeV compared to the ground state. Not...