Hydrogen Definition and 1000 Threads

I am looking for a brief summary of current hydrogen detection within galaxies. How are H I and H II detected? Is there a minimum required temperature and/or density ? How is molecular hydrogen detected? Is this the only form of hydrogen with sufficient density that can become opaque...

Hi everyone! So we're learning about the Hydrogen atom in QM and I'm having trouble reconciling something in my head. We're looking at potentials that are only radius dependent, like the Coulomb potential. Now, I know the math. I see that we assume the wave function can be separated into the...

Homework Statement A hydrogen atom at rest emits a photon with wavelength 410.1 nm. First, calculate the recoil of the hydrogen atom when emitting the photon. (recoil = momentum) Second, calculate the recoil of the hydrogen if we replace the electron mass with the reduced mass μ. Third...

Homework Statement In Bohr’s hydrogen atom, the frequency of radiation for transitions between adjacent orbits is νBohr = (En+1−En)/h. Classically, a charged particle moving in a circular orbit radiates at the frequency of the motion, νorbit = v/2πr. Find the ratio νBohr/νorbit for the...

Hi all ! I need some help Homework Statement The nucleus of an hydrogen-like atom is usually treated as a point charge Ze. Using the first order perturbation theory, estimate the error due to this approximation assuming that the nucleus is a sphere of radius R with a uniform charge...

The site http://physics.nist.gov/PhysRefData/Handbook/Tables/hydrogentable3.htm shows the intensity of various photon energy values from hydrogen. I was not able to see how this intensity was observed (ie. was it from a specific experiment, or does one simply look at the sun and count photons...

I know that a teller-ulam device uses lithium deuteride as its nuclear fuel. I know very little about chemistry, but why is a hydrogen bomb called a hydrogen bomb, if its nuclear fuel is lithium deuteride? Is it the hydrogen atom in the lithium deuteride that creates the fusion process?

When (what year and by whom?) was it discovered that the hydrogen potential is V=-1/r ? I imagine this was deduced from experimental data... amirite? Quite urgent... From wiki it looks like it was found in teh 1920's but I'm not certain so I just want to check. Thanks in advance

when proton and electron combine to form hydrogen atom(ground state) what is the source of radiation emitted

Homework Statement The average function of the H-atom in its ground state is ψ(\vec{r})=(1/(πa03)1/2exp(-r/a0) a0: Bohr radius a.What is the probability i. P(\vec{r})d3\vec{r} that the electron will be found in the volume d3\vec{r} around \vec{r}? ii. Pdr that the electron will be found...

Homework Statement I'm looking at two different time dependent perturbation solutions to transitions in hydrogen, and I'm wondering where the discrepancy comes from. Homework Equations See the attached documents- problem 2 in solutions5.pdf and exercise 2.10 in 2s decay.pdf. You'll...

Homework Statement Determine for the hydrogen atom states 1s and 2p the expectation value of the radius r and the associated mean square error Δr. Homework Equations Wave Functions for 1s and 2p from Demtroeder's Experimental Physics Volume 3 (it says "The normalized complete...

What is it exactly that causes the diatomic hydrogen to have such a greater volume than monatomic hydrogen?

When hydrogen chloride dissociates in water , does it form ions or atoms ?

I'm a little confused on hydrogen bonds. Here's a sample question and answer I'm having trouble with:1) In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by A) hydrogen bonds. B) nonpolar covalent bonds. C) polar covalent bonds. D) ionic bonds. E) van der Waals...

Hi All, I've googled everywhere trying to find out if the combustion/flammability of hydrogen is reduced at all for low pressure at high altitudes. There is data for hydrogen at high pressures, but I've been unable to find any data for low pressures. For example, if a hydrogen balloon stays...

Homework Statement The rms speed of nitrogen molecules in air at some temperature is 493 m/s. What is the rms speed of hydrogen molecules in air at the same temperature? Homework Equations Vrms The Attempt at a Solution

Homework Statement We know that: E=<\psi|H|\psi> where H=-\frac{\hbar^2}{2m} \nabla^2 - \frac{Ze^2}{4\pi\epsilon_0 r} and \psi=R(r)Y(\theta, \phi) with R(r)=\frac{1}{\sqrt{(2n)!}}(\frac{2Z}{na_0})^{3/2}\left(\frac{2Zr}{na_0}\right)^{n-1}e^{-Zr/na_0} If I want to find the energy, do...

Hi, I'm having a brain fart. Consider the amino acid glutamate (glutamic acid): -> When it forms an ionic bond with Na+ to make MSG, the glutamic acid loses it's hydrogen on the right side. Is it that it was "oxidized"? Or what do we call the process where it loses the hydrogen...

Now this is not a new idea. I had a thought about running my car on both hydrogen and gasoline. I bought a cheap car with an engine of good quality. Volvo 740. Mass-produced junk in other words. I thought that if I built a vessel on the engine manifold. The vessel to contain water and it will...

As I know from the laws of chemistry,to form H_2 the H atoms must have opposite spin. What if they have the same spin? I mean, can an H atom rotate to swap his spin (i'm not expert of the dynamics of spin), or there is no way to couple them? In the case I have a gas of H with all of them...

I wanted to know whether H2S is a polar compound and hence does it have a dp dp interaction. An answer sheet says the H2S only has id-id. If this is true can some one explain it to me? cause sulphur is definitively polar, and considering h2s's V shape, it should be a polar molecule, thus having...

Homework Statement Consider a photon that is barely capable of causing a photoelectric effect when it strikes a sodium plate having a work function of 2.55eV.Homework Equations Find the minimum energy level n for a hydrogen atom that can be ionized by such a photon, and the speed of the...

Homework Statement What does the non-negativity of the Coulomb Integral for H2+ suggest about the relative strengths of the attractive electron-proton force and the repulsive proton-proton forces? Homework Equations N/A The Attempt at a Solution I want to say that it means the...

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...

Homework Statement The level n=3 for atoms with 1 electron have the states 3s_{1/2}, 3p_{1/2}, 3p_{3/2}, 3d_{3/2}, 3d_{5/2}. If we ignore the spin-orbit coupling these states are degenerated. Calculate the degeneration due to the the spin-orbit coupling for the levels 3p and 3d for the...

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. What is the electron's orbital frequency? What is the effective current of the electron? Homework Equations Freq * Wavelength = Speed of...

If I add some HCl to water then I'll have H+ ions but for every proton there'll be be a Cl- counterion. I've never heard of a solution containing only the protons. You could make one if your conjugate base reacted with a solute to form a gas. The gas bubbles out and all you're left with are the...

Calculate the expectation value of the potential energy for an electron in a 1s orbital for a hydrogen atom Ive determined the potential energy operator to be V=-e2/4∏ε0r and a wave function of ψ= (1/4∏)1/2 therefore i get <V> = ∫∫∫ψ*Vψr2sin∅drd∅dphi integrals from 0 to r...

I am trying to figure out what the actual efficiency of solid state hydrogen storage is. So how many kg of hydrogen can you store in a Xcm3 of metal hybride solid state storage. I was trying to find a conversion and only found a metric that was 500NL in a specific device that had some...

Homework Statement http://en.wikipedia.org/wiki/File:Aspart… What are the 2 most acidic hydrogens in this molecule?and why? Homework Equations The Attempt at a Solution I narrowed it to: 1) the H on the carbon wedge connected to NH 2) the H on the carboxylic acid COOH...

Hey everyone, I was just wondering, in a PEM fuel cell the Hydrogen ion diffusion through the membrane is an important step. But don't these ions need to diffuse through the anode as well to reach the membrane? Also, if this is the case and the anode is a metal like Pt, wouldn't the diffusion...

As part of my Intel Science Fair project "How to make Hydrogen a viable alliterative" I read that at 3,500,000 psi Hydrogen will become a "Solid" so that you can have more power in less space which will make the car much more efficient. I am doing this on a 1/10 scale. My question is what...

what happen at atomic level to hydrogen under high pressure ... why it be come metal? any explanation in term of band theory ? or Nearly free electron theory?

Energy level of hydrogen atom -- with the electron replaced by a positron The energy level of a hydrogen atom is given by (without fine structure consideration) Eh = -13.6 eV / n^2 Suppose -- if the electron is replaced by a positron, what would happen to this energy level? The resulting...

Homework Statement An electron in a hydrogen atom is described by the wavefunction: psi(r) is proportional to (psi(subscript 100)+2psi(subscript 210)-3psi(subscript 32 -1) -4psi(subscript411)) where psi(nlm(subscript l)) are the eigenfunctions of the hydrogen atom with n, l...

most probable radii in hydrogen...? i just started studying quantum mechanics in college...i was told that according to quantum theory the most probable radii of 1s 2s and 3s in hydrogen are respectively a 6a and 11a, where a=bohrs radius for 1st shell sir told me that we get these values by...

H-5 hydrogen isotope -> "flip" ? As I understand it...H-5 (hydrogen isotope) = one proton and 4 neutrons. If this is true: ..."disclosed the 1/2+ ground state of 5H concealed in the smooth missing mass spectrum" http://nrv.jinr.ru/denikin/PhysRevC_72_064612.pdf Does 1/2+ spin of...

Hydrogen balloon naturally moves from low altitude to high altitude in Earth's atmosphere. Any object moves from higher to lower potential. So can we call low altitude high potential region?

At what distance do 2 hydrogen atoms (not ions) begin to attract each other? No, this is not a homework question. I am 58.

Hydrogen is such a peculiar element. It is placed in Group 1 of the periodic table. I can't find the reason why is it placed there. It exhibits none of the properties of that group 1 elements exhibit. One theory suggests that hydrogen can behave like a metal. Please explain how is that possible.

I had this problem for my physics class where we had a 20eV photon interaction with hydrogen gas. It takes 13.6eV to knock electrons off of the atoms from the ground state after the photon is absorbed by the hydrogen atom, but that leaves 6.4eV left over. Does all of this energy go into the...

What is the smallest amount of hydrogen needed so that fusion occurs automatically under its own gravity? How long would it last? Not homework.

If one were to subtract the kinetic energies of all fundamental particles within hydrogen, as well as all of the potential energy of all bound states between these particles, how much mass (as a percentage of the total) would remain? Ignore the kinetic energy due to the hydrogen's speed.And...

hi all, Real life industry question... An accurately calibrated cylinder of compressed gas sample of Hydrogen (certified 2% H2 and air 98%) is used to calibrate a hydrogen sensor by turning on its top regulator sample tap. It can be used for numerous calibration runs until it is empty. As H2...

Homework Statement 1)Determine the radius of the allowed orbits. Calculate the first orbit of Bohr's model for the hydrogen atom. 2)Show that the energy is quantized. Calculate the energy of an electron on the first orbit (fundamental state of hydrogen atom)Homework Equations L=n \hbar...

The wavefunction of hydrogen is given by \psi_{nlm}(r, \theta, \phi) = R_{nl}(r)Y_{lm}(\theta, \phi) If I am only given the radial part, and asked to find the expectation value of the radial part I integrate the square of the wavefunction multiplied by r cubed allowing r to range from 0 to...

Let's say I had a turbine in water, and I wanted to turn it based on hydrogen bubbling up from the water via electrolysis, how would I calculate the power gained from the flow of hydrogen/oxygen gases through it in a medium of water? I can calculate the buoyancy of these gases in water fine...

hello i going to make an moto bike of 50cc engine to work witn hydrogen... and my problem is : how many liters of hydrogen i vgot to pun in 1 litre of oxygen.. what carbirator i vgo to make.. or were i can take one li it for example the combution rating of fuel/oxygen is 14.7/1 i've...

I'm trying to plot the radial probability function for a hydrogen atom. I have the function itself (Psi2*4*pi*r2) my problem is that when I plot the function with angstroms on the x-axis, the y-values are larger than they should be (they look about right if I divide them by the bohr radius in...