Levels Definition and 471 Threads

Homework Statement Why doesn't the energy of the hydrogen atom depend on quantum numbers l or m? Homework Equations E = (Z^2) 13.6 eV / n^2 The Attempt at a Solution Regarding l: I know that it has to do with the inverse-square law between the distance, r, of the e- and the...

http://www.telegraph.co.uk/comment/columnists/christopherbooker/5067351/Rise-of-sea-levels-is-the-greatest-lie-ever-told.html But if there is one scientist who knows more about sea levels than anyone else in the world it is the Swedish geologist and physicist Nils-Axel Mörner, formerly...

Homework Statement The problem is what would be the effect on the width of the depletion region of an unbiased PN junction on the doping levels of the P and N sides Homework Equations This is a conceptual question. There is no equation involved. The Attempt at a Solution Increase...

Hi experts please explain energy levels of nucleus in emitting radiation in MRI

I was reading some EEIs on how Cyclones affect coral reefs on the Great Barrier Reef and I was read that one of the effects they have on the oceans is that they decrease the salinity levels in the water. I tried to find out why this is such a bad thing, but I cannot find anything on it... Can...

I'm confused about something. If there are an infinite number of energy levels available to an atom, how and why would an ionization need to take place? The electron always has another energy level to occupy once its energy has been raised.

hi i thought that if i try to derive the energy of an electron in a magnetic field, this could be done with the assumptions of the bohr model. L=n h/(2π) mv²/r=qvB => mvr=qBr²=>n h/(2π)=qBr² E=p²/(2m)=q²B²r²/(2m)=n h/(2π)qB/(2m) so i get the energy for the first level, but all transitions...

Explain how data from emissions spectra provide evidence for discreet energy levels within the atom?

Hello, I have some 10 signals in noisy and nonoise(noisy+good) situations. I just calculated the power of each signal in two cases and then used SNR formula for dB(10log noisy/nonoise). Now, I got noise levels in dB's. Here, i confused that these dB levels are referred to...

hope u all are doing good please anybody explain in ddetail about eign value and eign levels regards

Homework Statement Why are electronic levels present for an atom? What is the need for differentiating energy levels?

In what direction and by what action does chocolate affect cortisol levels?

Homework Statement The equilibrium separation of the atoms in H35CI equals 1.27 x 10-10m. Calculate the energy separation between adjacent lines in the rotational-vibrational spectrum Homework Equations E = (n + 1/2)h\omega + h2/ 2I * l(l+1) I = \mur02 \mu = m1m2/ m1 + m2 The...

Okay, this question straddles math, physics, biology, and chemistry, so I'm not sure if this is the correct forum to post it in, but I was using mostly chemistry knowledge to solve it, so I would guess that may be the correct method. Anyway, it's not homework, but it is similar to many homework...

Now, from what I understand, Bohr's model of the atom is outdated and flawed. But whenever I imagine energy levels, it is the Bohr's model that comes to mind. Do electrons really orbit around the nucleus? I would assume because of classical physics, even though the electron can be on any portion...

Hey! I had a discussion with a group of professors recently about the different disciplines one can master in electrical and computer engineering. There seems to be a prevailing notion that the closer one works to the physical layer, the harder his job is. Most of my professors seem to...

Suppose I have 2 sets of data: day1 and day2. I want to fit a model to both data sets and then compare them to each other to see which one fits the model the best (the fit is done with a computer using non-linear least squares method). The RMS of the fit would be fine except that day1 has much...

http://www.bbc.co.uk/news/science-environment-14258601

How do I find the energy difference between 1s and 2p, in a carbon atom? I'm right in assuming this is a constant value, and yet I cannot find the answer anywhere..? Thanks

Hey guys, So I want to simply pose a question. Conceptually, which is the hardest area of science to grasp? This can also be a sub category of a discipline...or anything like that. I'm just curious because I am a PhD student in Math, but my area is actually Mathematical Physics. So I...

Ok, I know that the S, P, D, and F represent blocks (groups of elements) on the periodic table. I know that the numbers represent rows on the periodic table. But what about the arrows? What's with the business of "increasing energy"? Why are the arrows slanted...

I'm having a bit of trouble understanding what's going on with the energy diagram of a PN junction. For your normal undoped semiconductor at zero bias, if you're plotting the energy as a function of distance along the material then you've just got the two horizontal lines where the upper one...

If the reactors have been without water, the core melts very quickly. The Fukashima Daiichi reactors 1-4 lost cooling and water flow shortly after the march earthquake and tsunami and the cores were exposed. If they were unable to get water flowing back into the reactors for several days...

One of my 'course aims' is to be able to classify the shell model energy levels in terms of quantum numbers l and n and explain how magic numbers arise. I'm using this to help to understand it as well as lecture notes. http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/shell.html I know...

Does light drinking (2 glasses per day) in men alter testosterone levels? There seems to be quite a bit of research regarding the affect of alcohol on testosterone but most seems to be focused on heavy drinking which might reduce testosterone levels. On the other hand, light drinking might...

I have a couple questions related to different energy levels and spin. Our professor taught us one way and the TA a different in our review session. We tried to hash it out in class but had to move on. I suspect both the TA and prof were talking about different things - or maybe stuff we won't...

1. What is the total sound pressure levels of two identical tones, each 88db SPL, when added together? For this question, using the equation dB SPL = 20log(P/2*10^-5), I found the value of P where dB SPL = 88, then doubled this value, then fed it back into the equation, to obtain a value of...

Homework Statement This is a two part problem. I think I am pretty close, but I'm quite understanding it. Which sucks because this is probably an extremely easy question.:frown: I have five particles in a box with S spin. I am to find the ground state of the five particles if they have...

If water were is heated to aproximately 90C will the water at this temperature have a different PH level to water at room temperature? Thanks,

problem is: (a)write down the spatial or orbital for two-non interacting particles, with the same mass, in a one dimensional well, where the potential energy is zero for 0<x<2a and infinite anywhere else. (b)What are the energies of the four lowest energy levels for the system in units of...

hi all.. i facing problem to get a good contour..because the scale at fringe levels so big. for example: level 8 = 1.224e+037 level 9 = 6.122e+036 level 10 = 0 i have 4500 element that the value from 0 to 6.122e+37..so the result that i got all in blue color because have a big difference...

if water is flowing in a streamline motion then at 2 points at same horizontal level can the pressure be same if area is not same ? please help!

Hey guys I'm new to this forum. I'm currently sitting for my 'o' levels in Singapore, but I am taking the SATs too. I'm taking the SAT reasoning test, Mathematics level 2 and physics paper. I would like to know if the SATs by itself is enough for me to enter a university such as Caltech? I'm...

Hi everyone, I am a second year physics undergraduate and I have recently become worried about being employed, even with higher education like a phd. Because of such anxiety I've explored the option of becoming an investment banker on Wallstreet, but I would like to know more information...

I have two simple questions: 1) What is the scientific term for "a body that cannot affect another body"? Effectively, as if this body has a mass of zero. The body can move freely until it contacts another body, in which case it will not be able to affect the other body in any way, and thus be...

Hi. Is there a formula for calculating SPL? The information I have is Frequency of pitch, dB level of pitch and 0dB as 20uPa. TIA

I have a roommate who blasts his music and bass below me till 5 am every night. It makes it very difficult to sleep and I have asked him to turn it down many times and every time he just curses me out. I would like to make it so his speakers don't play as loud or even that the bass is softer...

hey, i am concerned with landau levels and wanted to ask you whether you have a link, where one can see the orbitals- just like the orbitals for the hydrogen atom- for at least a few electron states? otherwise it would be sufficient if you could give me a hint how to calculate them. i...

Homework Statement Is the probability that an electron transitions from the N to M (n = 4 to n = 3) shell different than the electron going from L to K (n = 2 to n = 1)? So basically, should I expect to see a lot more transitions from n = 2 to n = 1, than any other type of transition? If...

I'm working my way through The Art of Writing Reasonable Organic Reaction Mechanisms by Robert B. Grossman (excellent book, by the way), but the way he describes resonance is confusing me. I feel like the more I think about it, the more confusing it gets. Consider a carbon-carbon double...

Homework Statement hi this is a problem that puzzles me. it goes like this: energy/10–18 J ionisation level 0.0 level D level C level B ground state A –1.9 –2.1 –2.4 – 4.6 An electron with kinetic energy 2.6 × 10–18 J collides inelastically with an electron in the ground state...

Homework Statement The carbon-dioxide has nondegenerate vibrational energies εr=（h/2π）ω(r+1);r=0,1,2..., where ω=(1.26*10^14)s^-1. What is the contribution of these vibrational modes to the molar heat capacity of carbon-dioxide gas at T=400K? Homework Equations...

where can I get information about the excitation levels (gamma ray spectrum) of a single proton nucleus?

Homework Statement This is part of a much larger problem, but I'm stuck on trying to draw an energy band diagram for doped silicon and I'm wondering if it is possible for me to find the energy levels ( E_c, E_v, E_f, and E_i ) in a doped semiconductor knowing only the concentrations? This...

I am writing an essay about what would happen if Planck's constant changed to a much larger number. What I am having a hard time with is the discretization of energy levels for bound system... how would that change if Plancks constant was larger? Thanks for all the help in advance.

So, according to the Fermi function, the higher the temperature of a semiconductor, the higher the likelihood that the electrons can jump to the conduction band. But in superconductors, obviously the temperature is extremely low, so how does the Fermi level, band gap theory, and...

The US keeps printing extra dollars, but what are the actions being taken to reduce the nation's debts? Alan Greenspan warns that the ballooning debt levels could lead to another crisis at the bond market. Together with the simmering race to weaken national currencies makes me very worried about...

If you solve Schrodinger's equation for a particle in a box you find the solutions to be sines and cosines. The boundary condition that the wave function must go to zero at the edges of the box then leads to the need for an integral number of wavelengths and in turn quantization of energy. I...

This works on so many levels here, I couldn't resist. https://www.youtube.com/watch?v=4va2s6w4nFE

Hi every body and how do you do first sorry of my weak language because I'm new physical Researcher at KACST & I'm learn English now before go to master degree so my physical question is about the number of electrons in the first level of energy levels we know the the first level can't...