Levels Definition and 471 Threads

Hi everyone, So I'm doing some research on fluorescence and I'm puzzled. I understand that running a current through fluorescent gasses like neon cause the valence electrons to jump up an energy level, and I understand that photons are emitted when they fall back down into their default...

Using the inverse square law could anyone tell me what the outcome of this problem is? If the radiation level is 400mGy/hr at 2m from the point radiation source, what will be the radiation level at 6m? I figured it would be 1600mGy/hr at the point, and therefore 44.4mGy/hr at 6m being...

I need help with a mini communication project. I am trying to receive signals from RJ45 Ethernet (10 BASE-T), which comes in three logic levels (-2.5, 0, +2.5) and convert it into two logic levels so I can drive a laser on and off. Would anyone know of any IC's that can accept these signals to...

I'm quite concerned about that...

I found the interaction energy U of an electron in an atom with orbital quantum number l=0 with a uniform 2.00-T magnetic field to be 1.159E-4 eV, now it asks what is the energy difference between the two split states? We have short 3-point quizzes each day before lecture just to make sure...

In "A Prime Case of Chaos" (http://www.ams.org/samplings/math-history/prime-chaos.pdf), the author states that "Physicists ... believe the zeroes of the zeta function can be interpreted as energy levels..." I have two problems with this: (1) the non-trivial zeroes of the zeta function are...

[PLAIN]http://img814.imageshack.us/img814/3943/fluidmechanics.jpg Please let me know is my assumption correct? P1 = P2 = P4 = P5 = Atmospheric pressure P2 not equal to P3, and P3 is not under the atmospheric pressure. P2 not equal to P3 even are the same fluid, is because of the...

In "A Prime Case of Chaos" (http://www.ams.org/samplings/math-history/prime-chaos.pdf), the author states that "Physicists ... believe the zeroes of the zeta function can be interpreted as energy levels..." I have two problems with this: (1) the non-trivial zeroes of the zeta function are...

Hi... I'm having a little trouble understanding this concept. An energy level is a level where fx. electrons can be in. Ground state, 1st excited state etc., right ? So if I'm not mistaken, a degenerate state is when two or more different quantum states (Fx. electrons) are in the same...

Hi, I was just wondering if the vibrational energy levels in molecules decay, emitting a photon? or by some other mechanism? For example, if a laser is used to excite a vibrational mode (Like that in Stokes-Raman Scattering) from say v = 0 to v = 1 state. Will the molecule remain in the v...

hi, the following question is extremely important so please reply! in an atom, the energy levels of the electrons are negative and the velocity of the electron increases when the energy decreases. however, this cannot be the total energy(in relativity) because it does not includes the...

On Swimming Pool Levels... Alright, this should be a simple enough question. Per code, the pipe which feeds my swimming pools self-leveling pump has a valve to prevent back flow, so swimming pool water does not contaminate the residential main. However, the valve is located at a point...

...Earth stopped rotating? Most of North America would be swamped under poleward rushing oceans. A whimsical but cool look at an Earth stopped in its tracks... From http://bigthink.com/ideas/21768".

Homework Statement Greetings everyone I have been been asked to write a 10 page essay on Quantum Energy levels in atomic, molecular, nuclear and solid state physics. My problem is that this is such a huge topic and my knowledge of quantum energy levels and solid state physics is limited...

Homework Statement a) Calculate the Fermi energy for copper. b) Calculate the ratio of the number of occupied levels at an energy of 8.5 eV to the number occupied levels at the Fermi energy at room temperature. c) Based on your answer to a) and b) above, show that at room temperature...

I read that each line on a line spectra for an element represents an energy level. Hydrogen only has 1 electron which is in the first energy level so why are there so many lines on the H line spectrum?

what i mean is could it be possible for an alpha particle to acquire energy (by collision or from emission) and subsequently emit a gamma ray?? or does only have one (ground) state??

Homework Statement Calculate the first three energy leveles for an electron in a quantum well of width 10Angstrom and infinite walls. Homework Equations En=\frac{n2pi2(hbar)2}{2mL2} The Attempt at a Solution m=9.109E-31Kg L=10E-10m hbar=1.055E-34 En=n2*6.032E-20 My problem...

i'm new here and I'm not sure if this has been asked before, but I'm just wondering about the cause of its existence. I'm speculating that it may be caused by interaction between a proton and electron together with their masses, if so, how?

Homework Statement How many transitions involving the hydrogen energy levels shown correspond to photons of infrared light? The infrared range is less than 1.8 eV Homework Equations Paschen Lines = Infared wavelengths The Attempt at a Solution I thought that since Paschen lines =...

okay this isn't exactly me asking how to solve a question but just to verify the theory in my head. i need to calculate the 4 lowest energy levels for a 3d box (that has sides (2a,a,a)) and show all the quantum numbers (i imagine it means the x,y,z components of n, l, ml) and give the...

Homework Statement A group of psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests. Two of these tests were significant at the 5% level. Suppose...

In GR, the strength of gravity goes to infinity at singularities. But what if in nature, gravity increases up to a certain cut-off, and does not continue to increase. If the cut-off is sufficiently low, could it be gravity is not strong enough to overcome pauli exclusion principle, and...

Hi Anyone, This is my first post here and i have a bit of a quandry. I'm doing some work related to hyperfine transition levels in Rubidium. Ive been looking and asking but no-one can explain to me satisfactorly how hyperfine splits occur. Mostly i get answers like " you should find out...

Homework Statement Consider a neutral carbon atom that has six electrons orbiting the nucleus. Suppose that five of the electrons are in their lowest states,but the sixth is in a very high state. Why might the energy levels for the outermost electron be similar to those for the single...

I am wondering if testosterone levels in humans are linked to advantages in fighting. I know they are linked to masculinity, and we all know that the more masculine a man is, the more likely he will be able to defeat a less masculine male in a fight. Do testosterone levels have a link to how...

Bhor's rule breaking "energy levels" when Ernest Rutherford's model of planetary system to explain the atomic structure, he was forced to have the regret by the fact that "accelerated charges dissipate their Kinetic energy into EM radiations." Bhor tried to avoid it.So he engaged the idea of...

I was instructed by my parents not to eat anything during the solar eclipse that occurred yesterday. Though this is rubbished as a superstition, i also hear reasons that goes like, "The UV radiation received by Earth is higher during the eclipse period triggering the growth of some microbes and...

What is the difference between levels of protein structure ( Primary , Secondary , Motifis , Tertiary , Domain and Quaternary )

Are there (available) energy levels of an electron say, at a distance 1m, or 100m or 1km away, and near the moon and beyond that belongs to an atomic nucleus on Earth ? If yes, then why does it prefer to be within the 10^-10 meter distance from the nucleus ? Sridhar

I am having an issue calculating the first few energy levels of Lithium. To add, electron-electron repulsions are ignored. Since electron-electron repulsion is being ignored, I am starting with the following, For Hydrogen...

H2 has a moment of inertia equal to 4.603 x 10-48 kg m2. 1) Calculate its bond length. 2) For the first 3 rotational energy levels, find the a) l quantum number b) ml quantum number c) the degeneracy of each rotational level d) energy eigenvalues e) the magnitude of l Ok so I...

1a. Determine the Sound Pressure level at a point due to a machine running alone if the measurements at the point with the machine 'on' and 'off' are 94 dB and 90 dB re 20 uPa respectivele b) Consider white noise where P(f) = A for f >= 0. Show that the SPL's corresponding to successive 1/N...

Hi guys I'm new to the forum, I'm currently studying in the UK. I Wanted to know peoples views on applying for top uni's such as Cambridge, MIT etc. I didn't do to well in GCSEs because I wasn't serious at the time. I got into AS and completely was overwhelmed by the amount of home...

In the famous diagrams of the energy levels of a hydrogen atom it seems that the energy levels get closer together as they increase such that the difference in energy between higher energy levels is less than between lower ones. But working from the electron in a box approach we get the...

Hi... I'm reading about "Particle in a box", and I really can't seem to figure out what "Energy Levels" actually means. The thing in my book is a bit slacky, so I'm not quite sure that I understand. So could anyone maybe explain to me what the "Energy Levels" in "Particle in a box" is ...

Here's the equation I'm dealing with (it describes the energies that an electron in a hydrogen atom can occupy) : En = -RH(1/n2) The way I understood, the bigger n was the farther away the e- was from the nucleus, so it would have more potential energy. But n is in the denominator in...

Homework Statement Find the quantum numbers of the three lowest states that have the same energy. (Enter the quantum numbers for the three states in increasing order of n1, using the format n1,n2.) Homework Equations En1n2=[(hbar)^2/(2m)]*[(pi)^2/(L^2)]*[(n1)^2+(n2)^2] -...

I have been reading through some of the older papers concerning CO2 levels in the 20th and century, CO2 residence times, and the carbon cycle. (The papers this linked to article and paper are referencing. Another source is the 2300 papers Ian Plimer references in his book Heaven and Earth.) What...

How many energy levels the oxygen atom have? What energy (in eV) is required to get to each level. From my research i have only been able to find the first two levels, the first of which is a forbidden level. 1.=.98eV 2.=1.63eV

The pKa for the dissociation of H3PO4 is 2.15. What is the concentration of H2PO4-1 (in M) at pH 3.21 if the original concentration of the phosphate was 2.37 M? My Attempt: Key Information: pH final: 3.21 Initial Molarity of phosphate: 2.37 M pKa: 2.15 I started with the first...

if a system is made of 3 atoms with no degeneracy with energy levels of fro example 0, e, 2e would it be safe to say that the system only has three microstate or will it be 2^3 microstates. if it is 2^3 can you please explain why?

microwave can be used to engineering potentials for alkali atoms i find that in the literature, people only take the magnetic dipole transition into account why the electric dipole transition is neglected? is it forbidden?

Homework Statement Couple of questions State the De Broglie Wavelength for electrons with an energy of 50eV and the following is a picture is a diagram of the energy levels in Fe: http://www.freeimagehosting.net/image.php?eeddf8b465.jpg What is the energy required to ionise Fe in in...

[FONT="Book Antiqua"] All who are familiar with this famous experiment, know that multiples of 4.9 Volts are used, which is associated with the difference between the ground state and one that belong to the next level. The question is it related to this transition (only ?), rather than also to...

Homework Statement the wavelengths of the emission lines produced by the hydrogen atom are given by the formula: 1/lambda = 1.096776 x 10^-2 ((1/n2^2) - (1/n1^2)) nm^-1 (a) what are the wavelengths of the first two lines in the Balmer series, H-alpha and H-beta (involving transitions...

Here's a question I've thought about on several occasions: How many levels of derivatives (rates of change) typically occur for objects in nature? For instance, a car has a position, velocity (1st derivative), and acceleration (2nd derivative), but it can also be said to have a rate of...

Homework Statement An absorption line at 6966 eV is known to come from a hydrogen-like ion. Calculate the likely atomic number of the element and hence identify it. (The ionization energy of hydrogen is 13.6eV.) Homework Equations not sure The Attempt at a Solution Using...

I know that light (such as that emitted by a fluorescent bulb) is generated by electrons falling into lower energy states and releasing an amount of energy as a photon. But radio is transmitted by producing an alternating current in a conductor, and (I assume) it's the acceleration and...

This is a general Organic Chemistry question. How do the reactivities of the following compare? Acyl Chlorides, Esters, Anhydrides, Amides, Ketones, Aldehydes The Attempt at a Solution I know the following "ladder:" MOST REACTIVE acyl chloride anhydride ester amide LEAST...