Bohr Definition and 198 Threads

I was deriving Bohr model formulas and I stumbled upon a problem. When I use the postulate that says that you can apply Newtonian Mechanics to orbiting electron, I wrote the Coulomb's force as following: Fc=(-e)*Z*e/(4pi(epsilon0)*r^2) Minus from the electron means that the force...

http://arxiv.org/abs/1105.4532 In case anyone is interested. John Archibald Wheeler was a a great 20th C physicist (he was Feynman's PhD advisor I think.) He had originality and vision. I'd like to have more links to online sources that have Wheeler remembering people and events of his...

Homework Statement The ionisation energy of a single hydrogen atom is 13.6 eV. The application of Bohr quantisation to the hydrogen atom results in the stationary states having discrete energies given in terms of a positive integer n according to E=-RB/n2 where RB is the Rydberg...

Bohr incorporates Plancks's quantum theory into his model, placing conditions on the value of the angular momentum. angular momentum = nh/2pi n=principal quantum number h= Planck's constant since its giving me the angular momentum, is it actually giving me a number that corresponds to...

hello, i am studying chemistry. There are a lot of things i do not understand though. This is not homework, just studies of my own that i would like to reach a deeper understand of. I love the responses i have read, so decided to make an account and learn from all you geniuses! Bohr model...

Hello, I am interested if anybody knows, how did Bohr came to the conclusion that only discrete angular momentum orbits are stable? In other words, m*v*r=n*h/(2*pi) and how did de Broglie came to the same conclusion, just through another way 2*pi*r=n*h/(m*v) Thanks

An electron around a hydrogen-atom, with radius r and length of circle a whole number, n, times wavelenght. This implies that 2*3,14*r=n*(wavelenght) I have read someplace that if you substitute the wavelenght with h/p, you can find the kinetic energy of an electron, which is the same as...

Maybe not only virtual particles don't truly exist (as believed by many physicists now). Real particles don't exist as well. According to Aage Bohr, the son of Neils Bohr, particles don't really exist. Nothing moved through the space between the emitter and detector in the double slit...

I think a problem with the bohr model of the atom was that if the electron was in orbit around the nucleus, it would keep emitting radiation of longer and longer wavelengths until it falls into nucleus. Why does an electron in orbit necessarily have to emit radiation?

Homework Statement (a) Derive an expression for the electron's speed in the nth Bohr model. (b) Prove that the orbit with highest speed is the n = 1 orbit,with v(1) = ke^2 / h compare this with the speed of light , and comment on the validity of ignoring relativity (as we did) in...

Creating metallic hydrogen has proved more difficult than expected. One explanation would be that the Bohr radius of Hydrogen is smaller than expected. Is there any other evidence of an error in Bohr radius predictions?

Homework Statement In the Bohr model, the electron is imagined to move in a circular orbit about a stationary proton. If the speed of the electron were 8.9e5 m/s, what would be the corresponding orbital radius? Homework Equations The Attempt at a SolutionFe=ma Fe=ma a=Fe/m (v^2)/r=(kqq/r)/m...

Homework Statement Given the potential energy V(r)=-\frac{1}{4\pi \epsilon_0}\frac{e^2}{r} (where e is the unit charge), use the uncertainty principle \Delta x \Delta p \geq \hbar to find the Bohr radius r_B for a hydrogen atom and the ground state energy E_0. Hint: write down the kinetic...

Homework Statement If the attractive forces between an electron and proton only due to gravity is F=(Gx Me x Mp)/r^2. What is the lowest gravitational Bohr radius? c=2.99799 x 10^8 m/s Me= 9.10939 x 10^-31 Mp=1.67262 x 10^-27 h= 1.05457 x 10^-34 G= 6.67259 x 10^-11 Nm^2/kg^2...

1. Consider Bohr Hydrogen atom with counter-clockwise electron orbit in the xy plane with intial position r(0)=-a0y. The angular frequency of the orbit is w. Derive an expression for the position of electron at a later time t, r(t) in terms of a0 , w, t, x, and y. Homework Equations...

I'm sitting with Physics Handbook and I'm trying to recall how the make out the orbitals in the energy levels. Let's take a look at the first levels. n = 1 - sub-shell K Number of electrons = 2n^2 \Rightarrow 2 electrons. Number of electrons = l = 0,1... n-1 \Rightarrow l = 0. This is where I...

Some places say (including this paper) claim the bohr radius of muonic hydrogen is 285http://ethesis.unifr.ch/theses/downloads.php?file=LudhovaL.pdf Many more peer reviewed papers say it is 256 fm, or 255 fm though. (search for '256 fm muonic' in teh googlez). So who is right? And more...

Thanks in advance for anybody who is kind enough to help me. No this isn't for my homework. I am not even enrolled in school. I am doing some calculations for personal research. But I need to know the ground state radius of a muonic hydrogen atom to help prove my theory. I already know the...

What quantities appear in both the Schrodinger approach and the original Bohr theory of a hydrogen atom? Also, in what ways do the two approaches differ? I'm not sure which quantities appear in both approaches. My guess would be that it has something to do with the energy levels and angular...

Homework Statement The normalized wave-function corresponding to the ground state hydrogen atom has the form \Psi _0 = \frac{1}{\sqrt \pi} \cdot \frac{e^{-r/a_0}}{a_0 ^{3/2}} where a_0 is Bohr's radius. 1)Graph the density of probability to find the electron in a spherical edge between r and...

Homework Statement Question: If we assume that an electron is bound to the nucleus (assume a H atom) in a circular orbit, then the Coulomb force is equal to the centripetal force: mv^2/r= ke^2/r^2 In the Bohr hypothesis, angular momentum, L = mvr is quantized as integer multiples of...

Question: If we assume that an electron is bound to the nucleus (assume a H atom) in a circular orbit, then the Coulomb force is equal to the centripetal force: mv^2/r= ke^2/r^2 In the Bohr hypothesis, angular momentum, L = mvr is...

Homework Statement According to Bohr's atomic model, 1)Determine the allowed radius of the orbit of the electrons. Calculate the radius of the first orbit for the hydrogen atom. 2)Show that the energy of the electron is quantized. Calculate the energy corresponding to an electron on the first...

Homework Statement What energy (in eV) is required to remove the remaining electron from a singly ionized helium atom, He+ (Z = 2)? (a) 3.40 eV (c) 27.2 eV (e) 76.9 eV (b) 13.6 eV (d) 54.4 eV Homework Equations Ei - Ef = hf The Attempt at a Solution Ef: the 1st level Ei...

I wonder if Bohr QM point of view could be labeled as "solipsism" or even "Metaphysical solipsism". Any hint would be appreciated. I may be wrong at some point, so I would be glad to hear other opinions or corrections. According to Bohr (subjective Copenhagen interpretation of Quantum...

Consider the Earth-Sun system as a giant-sized hydrogen atom, the objects interacting, however, by the gravitation force. (a) What is the quantum number, according to Bohr Theory, for the Earth's orbit about the Sun? (b) If the Earth were to make a transition to the next lowest quantum state, by...

The angular momentum of the Bohr atom is ⃗L = ⃗r× ⃗p Let the Oz axis of the unit vector ⃗uz be determined by the relation L = L⃗uz, in which L stands for the magnitude of the angular momentum vector ⃗L . (Basically L is in Positive z axis) We specify the position of the electron within its...

Homework Statement How does an electron get from an excited state (r = 4ao) to a ground state (r = ao) without being anywhere in between? Homework Equations The Attempt at a Solution My only attempt would be to say that it does exist between for a short time, and during that time it emits a...

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? E = hf = Eu - El = 2.825 eV That's the difference in energy between the initial and final states.

http://news.bbc.co.uk/today/hi/today/newsid_8493000/8493203.stm"

while doing some calculations such as calculating the Bohr radius or velocity of an excitons in semiconductors such as GaAs I didnt understand why is it allowed to use the static permittivity even though the electron and hole aren't as heavy and the spectra is measured at high frequencies such...

Homework Statement Classical physics applied to the bohr model of the hydrogen atom would predict that light could be emitted continuously, rather than in discrete chunks of energy. Transitions between what kinds of energy levels would come close to the classical viewpoint? A. Only levels...

Homework Statement Determine the wavelengths of photons given off for the 3rd line in the Lyman series , the 2nd line in the Balmer series, and the 1st line in the Paschen series. The question is weird, I don't understand what the "line" mean... "1st line in the Paschen series " Is it mean ni...

One of the curiosities of 20th century physics was that the complementarity principle was central to the QM revolution, yet physics only took heed of uncertainty. Why? Kote would certainly have an opinion. But here are some relevant snippets to remind others. Niels Bohr on the importance...

Homework Statement In the Bohr model of a hydrogen atom, what is the magnitude of the electric force exerted between the proton and the electron when the electron is in the n = 1 state? Homework Equations E= - 13.6 eV/ n^2 The Attempt at a Solution I simply...

Even though Bohr's model is defunct, one important element of it survived, namely the strictly quantized orbiting radii of electrons. Supposedly this mended the gaping flaw of Rutherford's model in that it predicted that electrons would no longer lose energy to photon emission thereby causing...

Homework Statement For a particle in a one-dimensional box of length a, I am attempting to find the probability that the particle will be located between 0 and a/4, in the limit of large quantum numbers. Homework Equations The Correspondence Principle states that quantum mechanical systems may...

Homework Statement Consider an hydrogen atom in its ground state, what is the probability that the electron is found inside the Bohr Radius? Homework Equations The probability of finding the electron at bohr radius is maximum. but the probability over the range from 0 to bohr radius...

Homework Statement How do you find the potential energy of the hydrogen atom in n=11 state using Bohr model? express in eV Homework Equations I used U= -kZe^2/r The Attempt at a Solution =-8.99e9(1.6e-19)^2/5.29e^-11 =4.35e^-18J / 1.6e^-19 =-27.2eV

do all of the electrons in an atom have to move up or down an energy level or is it just the valence electrons or what? is there one photon released per electron and are they all the same wavelength?

How can I calculate the potential energy of the electron when we bring it from the infinity to the distance r?

Homework Statement The Bohr model The Bohr model correctly predicts the main energy levels not only for atomic hydrogen but also for other "one-electron" atoms where all but one of the atomic electrons has been moved, as as in He+ (one electron removed) or Li++ (two electrons removed). To...

Homework Statement What
 is 
the 
wavelength 
of 
the 
emitted
 photon 
when
 HCl
 de‐excites 
from
 the
 first vibrational 
state? Well, I had to solve for the energy of the first vibrational state in the question before, assuming that it behaved like a harmonic oscillator using the...

This is more of a historical question than an actual physics question sorry... but it is physics related so here it goes I know when they first met Einstein and Bohr became good friends but does anyone know if they stayed that after all their famous debates about the paradoxes of quantum...

Homework Statement In the classical Bohr model of the hydrogen atom, the nucleus has one positive electronic charge Q_n = e = +1.602E-19 Coulombs and the single electron (mass = 9.1E-31 kg and Q_e = -e = -1.602E-19 C, one negative electronic charge) orbits the nucleus in a circular orbit. In...

bohr model: permitted radii? Homework Statement A new (fifth) force has been proposed that binds an object to a central body through a potential energy function given by: U(r) = -Dr^{\frac{-3}{2}} 2 r > 0 and D > 0 (a) What is the (central) force F(r) associated with this potential...

Homework Statement The Bohr model The Bohr model correctly predicts the main energy levels not only for atomic hydrogen but also for other "one-electron" atoms where all but one of the atomic electrons has been moved, as as in He+ (one electron removed) or Li++ (two electrons removed). To...

What are the major assumptions made by Bohr to explain atomic spectra from hydrogen? I had this on a test last week and was just wanting to know the answers. I was not required to answer it but am worried I will see it again. I looked through the book and can't find anything that is...

Homework Statement An electron moves along a circular orbit in the potential U=1/2*k*r^2. Using Bohr's quantization condition, find the permissible orbital radii and energy levels of the electron Homework Equations L=mvr=n*hbar The Attempt at a Solution Will someone put me on...

Homework Statement 4-16: if the angular momentum of the Earth in its motion around the sun were quantized like a hydrogen electron according to equation L=mvr=(nh)/2Π, what would Earth's quantum number be? How much energy would be released in a transition to the next lowest level? would...