Hydrogen Definition and 1000 Threads

Homework Statement Find the width L of a one-dimensional box for which n=5 level would correspond to the absolute value of the n=3 state of a hydrogen atom Homework Equations am i suppose to use n2h2/8mL2 where n=5 to equate it to the n=3 state of the hydrogen atom? which is -13.6eV/32...

Homework Statement Calculate the mass corresponding to the binding energy of an H atom. What fraction of the mass of the atom is this? Homework Equations BE=(mp+me-mH)c2 The Attempt at a Solution I couldn't figure this one out, so I searched for the answer online, and it's...

"Hydrogen Is Positive" Hello; My physics teacher said that hydrogen was positive. But, I don't understand why this is true. I thought hydrogen, like any other element, was electrically neutral (because it has 1 proton and 1 electron). So why is it positive? Thanks.

Hello, probably a simple question but here it is. Considering the orbitals of a hydrogen atom, let's take a spherical one. Now the radial wave function can have several nodes. (n-l I believe) So if I get this right, there are spherical shells around the nucleus where there is no chance of...

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.

Okay, so I've found this site (http://www.spiritofmaat.com/archive/feb2/carplans_doc.htm) and it claims to have a reliable method to convert a diesel engine to run off of hydrogen. Now, my question is is this actually feasible in the method they've described? I've asked two other sources and so...

Homework Statement The question involves a HI could in the ISM with an observed 21-cm emission line. I'm asked whether formation of molecular Hydrogen is likely. Homework Equations Not entirely sure The Attempt at a Solution First of all, I should say that this is a...

I am an A-level teacher so I don't want an answer in terms of anything too complicated (for my students!) The hydrogen atom has a ground state energy of -13.6eV. I am happy with this. This means that the electron needs 13.6eV of kinetic energy in order to become free of the nucleus...

Hi all. I am going to be doing an experiment involving neutron scatter. I am going to be firing fast neutrons into water and then detecting the thermal neutrons scattered. I am also going to look into thermal neutron capture where the hydrogen atom captures the thermal neutron and gives off a...

Homework Statement What wavelengths will be emitted if you bombard hydrogen gas (in its ground state) with 13 eV electrons. Homework Equations The Attempt at a Solution I talked to my professor about this one and he mumbled something about the ratio of the energies. I know the ground state...

Homework Statement for my comp physics course, we have to create a program that outputs all the possible electron transitions in hydrogen in the for n2 -> n1, where n1 < n2, and n2 < 21. We also have to determine the number of allowed pathways for the transition, and the energy and wavelength...

and if so is it the highest temperature superconductor known?

For a particular energy level in hydrogen, with quantum numbers n and l, one will find when considering the spin-orbit interaction, the level is split into two fine structure levels with energy separation: \Delta E_{s.o.}=\beta_{nl}(l+1/2) I was trying to prove this result. The spin of an...

Homework Statement A hydrogen atom has a diameter of approximately 1.06x10^-10 m, as defined by the diameter of the spherical electron cloud around the nucleus. The hydrogen nucleus has a diameter of approximately 2.40x10^-15 m. (a) For a scale model, represent the diameter of the hydrogen...

hydrogen atom is formed by the combination of electron and proton initially separated by in finite distance ,therefore, energy of hydrogen atom is expected to be equal to loss of electrostatic potential energy,but according to quantum mechanics it is not so.Is basic energy principle violated?

I have two asks first ask : In plot of probablity density of 1s electron of hydrogen atom when r=0 where electron exist ? is inside nucleus?! how happen this second ask what is the reduis of electron ri? and what reduis of nucleos RI is ? in Hamltonain operator i mean the...

Hydrogen burning in a star breaks chemical bonds and rearranges atoms in all hydrocarbon fuels.True or false? Thanks! =)

We know that Helium can have basically the same solution as the Hydrogen atom if there is only one electron. You get the same equation with a different factor on the potential and the basic solution is the same as the Hydrogen atom. But I'm trying to figure out why it can't work the other way...

Homework Statement 0.75 moles of NH3 molecules contain how many moles of hydrogen? Homework Equations The Attempt at a Solution

Hey all, I was reading some stuff on-line, when I saw a post by someone that said: Hydrogen, a colourless, odourless gas, which left long enough will turn into people. Someone replied: Negative. An abundance of primordial helium is also required otherwise fusion in stars proceed too quickly...

Hi, I have a question concerning a hydrogen spectrum: There are 4 energy levels drawn: Starting from the top -1.4 * 10^-19 Joules -2.4 * 10^-19 Joules -5.4 * 10^-19 Joules -21.8 * 10^19 Joules 1st question: Going from the second level to the third from the top (from -2.4 to...

The hydrogen atom is formed by the combination of proton and electron initially separated by infinite distance therefore energy of hydrogen atom is expected to be equal to loss of electrostatic potential energy but energy value as derived by quantum mechanics is different Why is it so

Homework Statement Light of wavelength 411 nm is emitted from a hydrogen discharge. What transition produces this emission? a. k = 5 to n =1 b. k = 4.5 to n = 2 c. k = 2 to n = 6 d. k = 2 to n = 3 e. k = 6 to n = 2 Homework Equations R = (1/n^2 - 1/k^2) The Attempt...

. Homework Statement [/b] In a hydrogen atom the electron and proton are bound at a distance of about 0.53A. (a) Assuming the zero of potential energy at infinite separation of the electron from the proton, what is the minimum work required to free the electron? (b) What would the answer...

Although a complete cost analysis is much more complicated, the particular question only requires the following: an energy cost estimate (in terms of $/Joule). This was directed to be done by taking volumetric or mass based costs of each fuel as well as the associated energy conent or energy...

Executive Summary This plan retrofits existing gas stations for hydrogen power with no distribution system. Salient Resources has designed a patent-pending energy source using naturally occurring processes that can provide the energy required to extract hydrogen directly at the pump. This...

Why distances between lines of hydrogen spectrum decreases even though the distance between the shells of Hydrogen increases as we go to higher shells? r=Ɛn2h2/πme where m=mass of electron, e=charge on electron h=planck's constant n=principle quantum number r=radius of hydrogen atom...

I know that in early time, in the first few billion years, there were stars containing helium and hydrogen that were huge. These were called Megasuns. Can someone tell me if these were the origin of SuperMassive Black holes. Thank You Harry

Homework Statement (a) Explain the term Hydrogen like ion and determine the quantum numbers l,m for the Li2+ ion in the states for which n=1 and n=2. (b) Explain why for a hydrogen-like ion it is reasonable to use the relations, \mu\approx{m_e}, {E_n}=-13.6\left(\frac{Z^2}{n^2}\right)...

thanks so much for the help

I’m from a group that is current working on the theory of a Hydrogen Economy. Our first area of development is the Hydrogen Highway. We are currently seeking help in the form of freelance / work for hire basically engineer(s) that could aid in design and calculations of internal combustion...

Homework Statement A hydrogen atom is initially in the state n=3. Subsequently it falls to its ground state with the emission of a photon. If the photon energy is ћω , then what is the ground state energy? The Attempt at a Solution I tried using E= h².n²/8ma². and got -9ћω/8 I wasn't to...

Can somebody elabroate on how the P.E. term e^2/r is thrown in shrodinger's(also Dirac) equation for the hydrogen atom by assuming such term does describe the effects of the negative and the positive charge. It enters into the equation like mass, yet quantum theory( a good one) should calculate...

Why is it that when two hydrogen atoms combine together, their combined energy is less than the energy of one hydrogen atom by itself? Why wouldn't the combined energy be twice as much?

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...

Let's consider eigenstates |nlm\rangle of hamiltonian of hydrogen atom. Can anyone prove that \langle r \rangle = \langle nlm|r|nlm\rangle = \frac{a}{2}(3 n^2-l(l+1)). Where a - bohr radious. I've been trying to prove it using some property of Laguerre polynomials (which are radial part...

As simple as the questions seems, I can't seem to find an answer. 1. Can atomic hydrogen by chemical reaction, be converted to molecular hydrogen? 2. what happens when putting electrodes in a reaction that would give me atomic hydrogen? would it be collected at the cathode like molecular...

What is the reaction of hydrogen and oxygen say in a vacant tube in absence of air, does it give Water, or hydrogen peroxide? and the amount of hydrogen and oxygen is the same of water ratio 2:1 In the Kanzius experiment, the hydrogen and oxygen are produced (together) and not ionized, so the...

Inter-atomic force in a Hydrogen molecule -- finding "spring" stiffness Homework Statement At about 2000 K the heat capacity (at constant volume =) increases to (7/2)k per molecule due to contributions from vibrational energy states. Use these observations to estimate the stiffness of the...

I have been trying to picture the whole process of a photon emission by a atom. So to have good understanding what is going on, I have came up with following experimental setup. A single hydrogen atom in excited state ^2\!P_{1/2}, which has been orientated with a magnetic field so that...

I often hear that stars form when giant clouds of hydrogen start to collapse under gravitational forces, so I started thinking about this. Gravity depends on the masses and distances of objects. So how many atoms of hydrogen would you need, and at what average distance would the atoms need to...

the question states that the emission spectrum of hydrogen contains a line with wavelength 656.2nm. and we need to approx find out what temp the H gas needs to have to be heated before this line appers in the spectrum i have worked out that for this wavelength the electron mov from level 3 to...

I'm interested in hydrogen injection for my 1 ton Dodge diesel truck to improve fuel mileage and power as well as lower pollutants. Electrolysing water to produce a stoichiometric mixture of hydrogen and oxygen (called HHO or hydroxy or "Brown's gas") and then injecting it into the turbo intake...

Could anyone help solve a problem how to find absorption lines in hydrogen atom from n=10 (n - principal quantum number). I know that not all quantum jumps of an electron in atom are possible, thus I don't know how many different emission lins will be from this energy level where n=10.

Homework Statement A cylinder contains 270 L of hydrogen gas (H2 at 0.0 C) and a pressure of 10 atm. How much energy is required to raise the temperature of this gas to 31°C? (answer needs to be kJ) Homework Equations PV =nRT and Q= MCT The Attempt at a Solution PV = nRT==> M=...

The Hydrogen Atom wave function. With the substitution u(r) = r.R(r) p=kr We get a simplified version: d^2u/dp^2 = [1 - (p_0)/p + l(l + 1)/(p^2) ].u Im sure some of you have seen that before. Now, in the limit, p goes to infinity, I understand that we get u = A.exp[-p], but in...

Homework Statement Below about 80 K the heat capacity at constant volume for hydrogen gas (H2) is 3/2k per molecule, but at higher temperatures the heat capacity increases to 5/2k per molecule due to contributions from rotational energy states. Use these observations to estimate the distance...

I come from Hong Kong and want to know the ans. THX very much! Also curious to know, which nationality will browse this forum most?

I assume general relativity allows us in principle to calculate volumes of some region of space? If so, if I have a large volume of space far from other mass and energy does it make sense to ask how much a large volume of space changes depending on whether or not it contains the mass of single...

1.A cloud of neutral hydrogen is moving towards us at a speed of 70 kilometers per second. At what wavelength would one observe the radio spectral line characteristic of neutral hydrogen? 2. The filament in a regular incandescent light bulb reaches a temperature of 2900 k when it's on. a...