The name Atom applies to a pair of related Web standards. The Atom Syndication Format is an XML language used for web feeds, while the Atom Publishing Protocol (AtomPub or APP) is a simple HTTP-based protocol for creating and updating web resources.Web feeds allow software programs to check for updates published on a website. To provide a web feed, the site owner may use specialized software (such as a content management system) that publishes a list (or "feed") of recent articles or content in a standardized, machine-readable format. The feed can then be downloaded by programs that use it, like websites that syndicate content from the feed, or by feed reader programs that allow internet users to subscribe to feeds and view their content.
A feed contains entries, which may be headlines, full-text articles, excerpts, summaries or links to content on a website along with various metadata.
The Atom format was developed as an alternative to RSS. Ben Trott, an advocate of the new format that became Atom, believed that RSS had limitations and flaws—such as lack of on-going innovation and its necessity to remain backward compatible—and that there were advantages to a fresh design.Proponents of the new format formed the IETF Atom Publishing Format and Protocol Workgroup. The Atom Syndication Format was published as an IETF proposed standard in RFC 4287 (December 2005), and the Atom Publishing Protocol was published as RFC 5023 (October 2007).
So firstly, the book supplies the answer of \Delta\lambda = \frac{h}{2mc}
I use energy and momentum conservation. I say the total energy is that of the incoming photon, which is then changed to energy of the photon released, and kinetic energy of the atom, from the recoil. I say the same...
What potential would one use when evaluating the Dirac equation of the hydrogen atom? Would it simply be in the form used when examining the hydrogen atom-Schrodinger equation or does it need modification?
I'm studying the Bohr's hydrogen atom and my teacher gave us a challenge question. When I was working in the problem I've got a couple of other questions that I don't know the answer.
The initial problem was the following:
Today we know the electrons are not the only particles moving inside...
I have a fairly straightforward question: how does one formulate the problem of hydrogen atom with quantum field theoretical treatment?
I understand that one can just take Uehling potential and find approximately the bound states' energies and wave functions, but it would not make electron...
Hello, all,
I have a question about the wave functions of H atom: for p orbital, wave functions from the Schrodinger equation are p+1, p0, and p-1. In chemistry, people use the linear combination of p+1 and p-1 to generate px and py orbitals. The question is: p+1 and p-1 orbitals are...
When we shine light on an atom, it can absorbs this radiation, stimulating its electrons to jump to a more energetic energy level. This lasts too little time, and when the electrons come back to their original (fundamental) energy level, they emit the same energy they had absorbed before. This...
When looking at a Chemical, what does this mean... "99.9 atom % D"
Hey,
can someone explain to me what this means.
Lets use D2o for example (Deuterium oxide)
1 store says "99.999 atom % D"
And the other store simply says "DEUTERIUM OXIDE 100% D,99.96% "
Can someone please shed some...
Can someone please help me on this physics question
The mass of a copper atom is 2.50 10-25 kg, and the density of copper is 8 920 kg/m3 .
(a) Determine the number of atoms in 1 cm3 of copper.
(b) Visualize the one cubic centimeter as formed by stacking up identical cubes, with one...
Simple and stupid question!
A Be atom is traveling with 60 kev kinetic energy and splits into two helium atoms, and the process itself releases 92.2 kev. One helium atom moves at a 30 degree angle with respect to x. find the direction of motion of the second helium atom and find the velocity...
How did scientists/chemists experimentally determine how many electrons an atom has?
Hydrogen, carbon, oxygen, etc...
I'm wandering what physical experiment would tell you how many electrons an atom has?
Homework Statement
Hi guys the question is
"Write down the time independent Schrödinger equation for the hydrogen atom,
and show that the wave function
Ψ(r,θ ,φ ) = Ae(−r / aB)
is a solution. (A is a normalization constant and aB is the Bohr radius.) What is
the energy of the state with this...
When I write down the Hamiltonian for the hydrogen atom why do we not include a radiation term or a radiation reaction term? If I had an electron moving in a B field it seems like I would need to have these terms included.
Homework Statement
Find bond energy of valence electron in principal state in Li atom 2S. If first line of the sharp series is 0.813microm and short wave boundary is 0.349 microm.
Homework Equations
i think I have to use \tilde{v}=R[( 1/(x-(Δ)) )^2-( 1/(n-(Δ)) )^2]
Δ-quantum...
A hydrogen atom is in its ground state and is subject to an external electric field of
E = ε(\hat{x}+\hat{y}+2\hat{z})e-t/\tau
I'm confused as to how to compute the matrix elements of the perturbed hamiltonian since this is not in the z direction.
Would I have to do something like this...
Homework Statement
A Na atom is in an excited state for a mean time of 1.6 \times 10^{-8}s. Then it jumps to the ground state emitting a photon with 2.105 eV of energy. Find the energy uncertainty of that excited state.
Homework Equations
The Attempt at a Solution
I don't even...
Homework Statement
What are the orbital angular momentum possible values for an electron in a hydrogen atom with a principal quantum number n = 3?
Homework Equations
L = \sqrt{l(l+1)}\hbar
The Attempt at a Solution
Possible values for l are 0, 1, 2.
So, substituting these in...
Homework Statement
1. Consider the boron oxide molecule, BO, in the ground state.
(a) Calculate total energies separately for each of B and O atoms (in their ground states).
Homework Equations
(1 Hartree = 27.212 eV, 1 eV = 23.045 kcal/mol).
The Attempt at a Solution
Etot =...
Homework Statement
In a Stern-Gerlach device, an atom beam with angular impulse J, travels through a magnetic field applied normally to the trajectory. The beam is separated in 2j+1 beams in general. Find the relative intensities for these beams if J=1 and if the beam is polarized with jθ=1 in...
Homework Statement
Whenever a photon is emitted by hydrogen atom in the Balmer series, it is followed by a photon in Lyman series . What wavelength does this latter photon correspond to ?
Homework Equations
Balmer series corresponds to the wavelengths in the visible spectrum and Lyman...
Homework Statement
What is the energy of H atom in the first excited state if the potential energy in the ground state is taken to be 0 ?
Homework Equations
Usually the energy of H atom in the ground state is -13.6eV
and in the 1st excited state is -10.2eV
E(n) = πme2/8ε2h2
Bohr's...
Given a simple atom like the Bohr atom (and possibly generalized to any other atom), I know that an electron can transition from one energy level to another, either by absorbing or releasing a photon of a precise hf. How much time does an electron take to make a transition from one energy level...
Homework Statement
There are a few problems I have with my HW that involve the characteristic size of an atom in a certain state. For example, the hydrogen atom in the ground state.
Homework Equations
-
The Attempt at a Solution
I don't know where to begin to find the characteristic...
Hi I am in a material science class and one of my homework questions states:
"Calculate the radius of an iridium atom,given that Ir has an FCC crystal structure, a density of 22.4g/cm^3,and an atomic weight of 192.2g/mol."
I think I have to use the Pythagorean theorem somewhere but my...
Homework Statement
A Hydrogen atom is in a state with n=2?
Homework Equations
r=an^2
a=.0529 nm
The Attempt at a Solution
I am confused by my book it says that the radius of a stationary state is r=.0529*2^2=.2116 but I disagree isn't the stationary state n=1 which would mean the...
Homework Statement
A hydrogen atom in an excited state absorbs a photon of wavelength 434 nm. What were the initial and final states of the hydrogen atom?
Homework Equations
1/λ=1/91.127 * (1/nf2-1/ni2)
The Attempt at a Solution
Tried to use the equation, but keeping the initial...
Homework Statement
Describe what happens to the ionization energy, electronegativity and atomic radius as electrons occupy the next sub level.
Homework Equations
The Attempt at a Solution
My (probably incorrect) answers:
Ionization Energy: As electrons occupy the next sub level...
Homework Statement
An atom of mass M decays from an excited state to the ground state with a change in mass of ΔM<<M. In the decay process, the atom releases a photon. Use the laws of energy and momentum to determine the energy of the photon, assuming the atom decays from rest.
Homework...
What is the origin of the internal magnetic field in an atom (which gives rise to spin-orbit interaction in an electron).
The energy associated with this field is calculated using the reference frame of the electron and then returning back to the nucleus reference frame (thomas precision). But...
Homework Statement
https://www.physicsforums.com/attachments/51461
https://www.physicsforums.com/attachments/51462
Hi! I got stuck in studying the book "introduction to electrodynamics" written by griffith
I attached the related pictures above. The page is p.161-p.162.
It's concerned...
Homework Statement
The HCl (hydrochloric acid) molecule has a dipole moment of about 3.4x10-30 C.m. The two atoms are separated by about 1.10-10 m. What is the net charge on each atom? What is maximal torque that this dipole will experience in a 5.104 N/C electric field? How much energy one...
I know this question is probably fairly basic but I had a hard time finding an answer on google. Does a single atom vibrate/jiggle/oscillate if it has a temperature (ie is not at absolute zero)? Is this vibration random in direction? If it is random, wouldn't this violate the law of...
I am studying for my exam and I have run into this problem. The problem is given here http://faculty.mint.ua.edu/~pleclair/PH253/Homework/Spring_2010/HW6-7_atoms_12Mar10/HW6-7_atoms_12Mar10_SOLN.pdf"],[/PLAIN] it is #9.
I don't understand why -e ≠ ∫ρdV from 0 to the bohr radius, a0. If all...
I find that I cannot find some simple and basic data - when I search, I find recent articles working on advanced extra experiments, but basic facts are taken for granted there and not repeated.
What happens to a muon in an atom?
Obviously, a free muon decays
μ->e+ν~e+νμ
with lifetime...
A sole hydrogen atom in a vacuum (negligible gravity). The hydrogen atom has the lowest possible kinetic energy allowed by QM. Given that casimir effects apply...
Will the hydrogen atom remain at it's initial lowest kinetic energy state indefinitely or is it possible for it's energy state to...
Hello all,
Many Physics texts simply say that atoms "vibrate" when heat energy is transfer to a metal bar when it is heated. Or that molecules vibrate as the result of heat transfer.
I'm trying to understand what makes an atom or molecule "move" or oscillate when energy is given to it.
If I...
Homework Statement
If there are 13 electrons in M shell and one electron in N shell, the the number of unpaired electrons in such atom will be
Homework Equations
M- shell N- shell
The Attempt at a Solution
The configuration should be
3s2 3p6 3d5 4s1
hence the answer should be 6
I am given a critical bare slab reactor 150cm thick (a0=150cm) consisting of a homogenous mixture of U235 and graphite.
I am stuck on the part which asks me to calculate the critical atom dennsity. I have solved for the mass of the fuel in terms of the mass of the moderator. I would solve...
In its ground state, an atom has no net electric dipole momentum ,but it can have a nonzero angular momentum.
Is this a spontaneous symmetry breaking?
why the ground state is not of zero angular momentum?
Hi,Everyone! I have a question! We often say hydrogen atom spectrum. But in nature ,it exists in the form of molecular hydrogen. today, I read something about hydrogen atom spectrum experiment. In the experiment ,we use hydrogen lamp. The Hydrogen lamp is a long glass tube filled with Hydrogen...
Here's a pic from Sean Carroll's lectures on Dark Matter and Dark Energy available through the Teaching Company:
I just want to double check, there are two types of atoms, if I understand the delayed choice experiment correctly, just the knowledge that you can detect the atom transforms...
Does this decay leave the He3 atom with only one electron? The only decay productsas far as I can tell are the electron and antineutrino, so it seems like the atom would only retain the original H3 electron.
Now if that's the case, why is the beta decay electron emitted rather than fitting...
Hi, a question I have been asking myself is what where to happen if we where to look deeper into the atom? Is there a point in where there is really nothing? As far as I know it only goes down to quarks. Is the quark the end of it or is there more?
1. Homework Statement and attempt at a solution
Considering that the ground state of the beryllium atom is 2s^2 and the first excited state is 2s2p, I was wondering in how many lines would the emission/absorption spectrum be modified in a weak magnetic field.
I know that if there's no...
Hello guys - my first post!
Why do we have neutrons and protons in the center and electrons around them? Was the atom like this since the beginning of the universe(or rather did atom exist in the beginning) or did it get structured in this way after sometime?
Did the neutrons, electrons and...
i've read a theory about dark stars resently and I've got some questions that's been gnawing at my mind, hope i can get some answers here.
1: what is the size of an atom? as in if the nucleus was the sun, where would the electrons be? i know diffrent substances has diffrent atom sizes but for...
Homework Statement
He+ ion consists of a nucleus which is an alpha particle plus one orbiting electron.Hence it has a net positive charge.
a)Derive an expression for the electron state energies
b)what is the wavelength associated with a transition between the lowest two energy states...