Atom Definition and 999 Threads

If I understand it right an atom is made up of mostly empty space. http://education.jlab.org/atomtour/fact3.html What is the nature of this space? Is it like the space-time that Albert Einstein spoke of?

Homework Statement Using the uncertainty principle find the energy required for the electron to be confined inside the hydrogen atom. Use the radius of the atom 1 x 10-10 m for Δr. Express your answer in eV, rounded up to the nearest hundredth. Homework Equations ΔxΔp\geqh/4pie...

Homework Statement using first-order perturbation theory ,estimate the correction to the ground state energy of a hydrogenic atom due to the finite size of the nucleus, assume it's spherical nucleus. Homework Equations you can employ the fact that the electrostatic potential fi...

Homework Statement A hydrogen atom can be considered as having a central point-like proton of positive charge +e and an electron of negative charge -e that is distributed about the proton according to the volume charge density rho=A*exp(-2r/a_1). Here A is a constant, a_1 = .53x10^(-10)m is...

I heard that it is possible to measure positions of individual atoms in a crystal. Is this true? I understand the principle of measuring crystal orientation and base vectors of Bravais lattice with X-ray, but I have no idea how positions of individual atoms can be obtained. I suppose it is...

Homework Statement A hydrogen atom has an electron in the fundamental state. a. Show that a radiation with λ = 50 nm will ionize the atom. b. What will be the excess kinetic energy of the electron in joules? Round up your answer to the nearest hundredth. Homework Equations 1/lambda=...

Homework Statement In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. A) What is the electron's orbital frequency? Homework Equations F = qE E= kq/r^2 angular velocity = v^2/r The Attempt at a Solution I'm...

consider a water molecule.. it is heated beyond its boiling temperature..it turns into wet and superheated steam..later but what happens to..it.. ?? please answer my question

Homework Statement Hello. I'd like to solve this: -\frac{\hbar^2}{2m}\nabla^2 \Psi(r,\theta,\phi) -U(r) \Psi(r,\theta,\phi) = E\Psi(r,\theta,\phi) Homework Equations The Attempt at a Solution I can separate the variables, but that's about it. \frac{1}{R(r)}...

Hello, I'm fairly new with the nuclear physics, but I'm willing to study and learn as much as possible. I've been reading on wikipedia about the nuclides, but I couldn't understand what is the difference between an atom and a nuclide? On wikipedia they say that a nuclide is a...

Homework Statement A proton is fired from far away towards the nucleus of a mercury atom. Mercury is element number 80, and the diameter of the nucleus is 14.0 fm. If the proton is fired at a speed of 32100000 m/s, what is its closest approach to the surface of the nucleus (in fm)? Assume that...

Hi all: As we know, if we solve the schrodinger equation, the ground state wavefunction is independent of theta and psi. We find the expectation value of ground state orbital angular momentum is zero. But if we don't do any mathematical calculation, can we conlude that? For example, Due to...

Homework Statement The water molecule forms an angle, with hydrogen atoms at the tips and the oxygen atom at the vertex (see diagram in the previous problem). Assume that the angle at the oxygen atom is Θ = 103.5o and the distance between the oxygen and the hydrogen atoms is d = 93.1 x 10-9...

Zero point energy and hydrogen atom In quantum mechanics, the lowest energy level of Simple Harmonic Oscilator is not zero and equal to hw/2. It is called the zero point energy. Is the energy level at ground state of hydrogen atom the zero point energy also?

I am having some difficulty understanding the concept of colour charge. I realize that protons and neutrons are made up of a different number of quarks, and this is how they have the charges +1 and zero. I then realized that different quarks have color charge and that in a hadron (protons...

in a single atom can more than one electron be transitioning between electron shells at the same time? can the atom be emitting more than one frequency at the same time? or is there some rule against this?

Hey there. I'm trying to redo basic quantum chemistry with a lot more rigor. I'm currently using Pauling's "Introduction to Quantum Mechanics With Applications to Chemistry". Here is a copy of the page(s) I will be referring to...

Where EXACTLY is the "Mass" of an Atom? Proton? Quark? Hadron? Gluon?? Just look at the simplest Hydrogen atom -- one Proton. The question is *where* exactly is the mass of this thing? Or *what* makes up the mass of this thing? Is it just Quarks? So where is the *mass* of those things? Where is...

In most of quantum textbook, they say strong magnetic field destroy the spherical symmetry of an atom in zeeman effect. Total angular moment is not conserved. Can anyone explain what physical meaning is? I cannot picture it in my mind. How does strong magnetic field cause spherical symmetry...

im just learning the quantum model of the atom now and i have a few questions, 1st: why does the different energy levels represented by the primary quantum number n have different numbers of subshells represented by l such as 0,1,2,3. Energy level 1 can only have s or 0 but Energy Level 2...

I don´t understand how can an excited atoms generate photons, ex. a incandescent lamp. Does vibrating eletrons emit eletromagnetic fields ? Thanks a lot

I'm trying to follow some working by lecturer; Treating delK (previously found in first bit of question), show that the energy En of the usual hydrogenic state [nlm> is shifted by some expression given. basically we start with \[ \frac{1}{2m_{0}c^{2}} \left\langle...

I thought these were weird similarities between macroscopic electronic circuits and (Bohr) hydrogen model. What do you guys think? . hydrogen self-capacitance (energy level "capacitance") C = 4*pi*eo*br = 5.88798e-21 Farads eo = vacuum permitivity br = Bohr Radius m = electron mass e =...

If charge radiates on acceleration,what would happen if we accelerate a neutral atom..will this radiate or not? this neutral atom also has electrons and protons which are charged so they should radiate but as a whole this neutral atom should not radiate?both are contradictory.. is this...

Homework Statement An atom initially at rest emits a photon with frequency f. Explain why the mass of the atom decreases, and by an amount greater than hf/c^2. Homework Equations E= mc^2 E = hfThe Attempt at a Solution So I know that the atom must lose mass when the photon is emitted...

Homework Statement One wave function of H like atom is \psi=\frac{\sqrt{2}}{81\sqrt{\pi}a_{0}^{3/2}}(6-\frac{r}{a_{0}})\frac{r}{a_{0}}(e^{\frac{-r}{3a_{0}}})cos \theta How many nodal surfaces are there? 1)1 2)2 3)3 4)none of these The Attempt at a Solution Its an objective...

can electron energy levels just be considered the self capacitance of an atom?

Homework Statement Consider a Hydrogen atom in the ground state Find: A- The Kinetic Energy, in eV B - The Potential Energy, in eV C - The Total Energy, in eV D - minimum energy required to remove the electron completely from the atom, in eV E - What wavelength does a photon with the...

Hi, I have been given a differential equation to use in order to solve for the Hydrogen wavefunction in the ground state using Euler's method. d^2u_nl/dr^2 -(l(l+1)/r^2)*u_nl + 2k*(E_nl-V(r))*u_nl = 0 V(r) = -a/r where a = 1/137.04 I have been given initial conditions u_nl(0) = 0 an...

Hi all, I am a new member in your forum and I am very pleased to join it. This my first theard in this great forum. My Q.: The unit of time was originally defined as 1/86400 of the mean solar day. Because of irregularities in the Earth roatation, the definition was changed to the ''...

How many wavelengths could appear in the spectrum of hydrogen atoms initially in the n=5 state?

An electron with a kinetic energy of 4.9eV collides inelastically with a stationary mercury atom. Why can you assume almost 100% of the electron's energy can go into raising the mercury atom to its first excited state? I know that with an inelastic collision both energy and momentum are...

Homework Statement When a excited atom hydrogen ( wavelength ) de-energized emits energy and the electron returns to the fundamental situation. If the wavelength of the radiation emitted is 121 nm, to find what was the energy level of the individual electron of hydrogen atom ( Η ) in the...

Homework Statement A neon atom (m = 20.0 u) makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at a 57.9° angle from its original direction and the unknown atom travels away at a -45.4° angle. What is the mass (in u) of the unknown atom...

Homework Statement A Hydrogen atom in its ground state (n,l,m) = (1,0,0) is placed in a weak electric fieldE(t) = 0 if t < 0 Eo *e^{\frac{-t}{\tau}} if t > 0E is in the positive z direction What is the probability that it will be found in any of the n=2 states at time t > 0 ? use...

Just wondering.

The intense laser-atom physics becomes hot today. There is a famous interesting phenomenon: High-order harmonic generation (HHG). Lots of works are on the single atom response in the strong field approximation. Some of them obtain the spectrum by solving the Schrödinger equation. Then they say...

Homework Statement Say that an atom has the following energy levels: E1 = -9.20 eV E2 = -6.20 eV E3 = -3.70 eV E4 = -2.40 eV E5 = -1.60 eV Suppose atoms in the E2 level are exposed to incident radiation of wavelength 413.3 nm. Would this radiation be absorbed by atoms in the E2 level...

What wavelength of light would be required to remove an electron from a gaseous atom of tin? Here, I used Plank's constant h as 6.62*10-34 J.s and Constant c as 3*108 m/s Also, energy needed to remove an electron is calculated by \DeltaE =hc/\lambda I also used Broglie Eqn: \lambda =...

Cesium is often used in "electric eyes" for self-opening doors in an application of the photoelectric effect. The amount of energy required to ionize (remove an electron from ) a cesium atom is 3.89 electron volts (1 eV = 1.60 x 10-19 J). Show by calculation whether a beam of yellow light with...

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...

Homework Statement A muon is captured by a deuteron to form a muonic atom. Find the energy of the ground state and the first excited state. find the wavelength when the transition occursHomework Equations E_{n} = \frac{-13.6Z^{2}}{n^{2}} \frac{1}{\lambda} =...

Homework Statement Calculate the de broglie wavelength (DBW) of an electron with kinetic energy 60 GeV. What percentage of an atom's diameter can it penetrate? Homework Equations DBW = h/p p=mv The Attempt at a Solution Basically I have an electron traveling at the...

If an atom in it's ground state has 35 electrons, then how many of these electrons are in the l = 2 subshell?

What part of the atom creates light?? what part of the atom is responsible for making light, and what particular action must it undergo in order to make light. i have a basic understanding of electromagnetic wavelengths, and am curious as to how they are produced, and what occurs at the...

if the electron has spin 1/2 and proton has spin 1/2, why is the hydrogen atom (which is made of the electron and proton) have spin of 1/2?

hi this is probably basic physics but how do u work out specific charge of say the nucleus of a carbon atom? thanks Marco

Hi everyone, This question is from my problem set this week in my Phys 371 class. Any help, hints or ideas would be very much appreciated! "Use the Heisenberg Uncertainty Principle to estimate the ground state energy in the hydrogen atom. Since the wave function that solves this problem is...

I'm studying A2 (second year college) physics and I am supposed to be finding out about the size of an atom and how it was figured out but I'm having problems because of the fact that nobody seems to know. I realize it is different for each atom/ion but how could it be figured out? Maybe it's a...