how does the electric quadrupole cause brodening of nmr signals?
969369
The rapid tumbling in solution of molecules modulates the electric quarupole interaction this causes rapid relaxation of the nucleus. Rapid relaxation implies that T2 will be short the FID will be short and so the lines will be broad.\nIn some compounds the quadrupole moment may be so big that molecular motion may not average it to zero also leading to broadening.
792398
Hi. The experiment used a torsion scale, a very thin wire with known strength, to support the center bar. The smaller balls were attracted to the larger ones and caused the wire to twist just a little. From this the mass of the lead balls was used to calculate 'g'.
244341
Look up the mecahnical univers 43? on magnetic induction.
339047
It is just a reference to E=mc^2.  It can be through fission or fusion, so yes you are surely correct.
789773
let us understand it in a simple way:\n   Suppose you have a magnet as shown below:\n                                [ N ]\n                                [ S ]\n\nBy cutting the magnet centrally, if you  mean cutting it vertically, then we would obtain the following configuration after cutting the magnet:\n                              [N] [N]\n                              [S] [S]\nThat is to say we have resulted in two magnets with polarities as shown above.Now as we all know that like polarities(N-N, S-S) repel and unlike polarities(N-S,S-N) attract, the result follows that the two magnet in above configuration repel each other while they attract when one of them is rotated by 180.\n[When one of the magnet is  rotated (say the second one) the following configuration results:\n                            [N] [S]\n                            [S] [N]\nand hence the result.]
714427
I'm sorry, but the previous answer was very misleading.  First of all, an electron's spin does not give it its charge.  After all, neutrons spin yet they have zero electrical charge.  Its spin gives it a magnetic moment, which is subtly different from a magnetic field.\n\nA charged object such as an electron moving in any trajectory will create a magnetic field.  A charge moving in a helical path will create an approximation to a solenoidal magnetic field.  In current carrying wires, the electrons are moving collinearly with the electric field created due to the potential difference, i.e. in more or less a straight line.\n\nNow, why does the moving charge create the magnetic field in the first place?  A good way to explain it is with an example.\n\nSuppose you have 2 protons (+ charge) placed close to each other, the pair initially being stationary with respect to you.  You know what would happen right?  They would drift apart, repelled by their like positive charges.\n\nNow picture yourself running very fast, past those two protons.  If you run fast enough, the relativistic time dilation will make it appear, from your perspective, that the protons are drifting apart more slowly... as if some force is holding them back.  If you consider that you running very fast with respect to the protons is the same as the protons moving very fast with respect to you, you can see that the two moving charges are having an effect on each other which cannot be explained by their electric field strength alone.  This is what we call the magnetic field, essentially a relativistic distortion of the electric field due to time dilation.
1173860
http://www.oz.net/~coilgun/theory/solenoidphysics.htm
837121
Hmmm.. The one affecting the boiling point is the intermolecular force..\nAs you can see, most of the compound here is polar. \n\nTherefore all you have to do is if the compound is consisted only of 2 elements (Group 17), you'll have to calculate the electronegativity difference. The more difference between them, the boiling will increase as well.\n\nIf there is more than 2 atoms in a molecule, you'll have to see the dipole moment magnitude (a.k.a polarity). The higher the magnitude, the higher the boiling point will be.\n\n\npeace\nvixklen
86731
The splitting and shift of a spectral line into several components in the presence of an electric field.
797567
Hi. From the web : "The quantum nuclear-spin relaxation rate (T-11) is computed as functions of magnetic field and temperature. A possibility that T-11 can be used as a magnetic probe in studying the electron-electron interaction in high-mobility 2DEG systems is discussed." I would say there was an effect.
538049
Yes.  In fact protons even from two different elements are indistinguishable.  This is a fundamental property that is quite interesting, and it results in some very odd behavior.
910706
so you plot the proton number on the y-axis, and the different melting points of the elements across the x- axis.. actually are sure it has to be a bar graph.. i think a line/scatter graph would be more accurate maybe?
1185774
We have used short laser pulses to examine the process by which two ground state sodium atoms cooled to 0.5 mK in a magnetooptic trap absorb two photons tuned to the atomic 3S &#92;rightarrow 3P transition to produce a molecular ion by associative ionization. The 10 ps pulses are split into two pulses with the second pulse delayed up to T = 12 ns relative to the first. For T < 4 ns we see an enhancement of the ion signal, while for T > 4 ns the signal decays with a time constant of roughly 10 ns. The first laser pulse excites the atom pair at long range to an attractive R^-3 potential from the 3S + 3P asymptote. The second pulse promotes the pair to an attractive R^-5 potential from the 3P + 3P asymptote, where associative ionization can occur at short internuclear distances. We have simulated the behavior with a conceptually simple yet accurate model that predicts an enhancement of the flux of atoms caused by longer times spent on the intermediate potential.
359558
i learned about this in chem.  it's hard to explain...but if you put a cd in your microwave(if your parents allow u 2) then you can see it.  if u need help, you could e-mail my teacher by getting his e-mail address from his website below.  hope that helps!
1005095
The name magnetic resonance imaging is not the original name of MRI.  It was originally called a NRI for nuclear resonance imaging.  The company that first made them didn't want people to think it was a nuclear reaction so they changed the name to magnetic.  It is not a nuclear reaction though, an MRI sends out very strong oscillating magnetic fields.  Every atom in the universe and in your body has a nucleus, and the nucleus has its own oscillating magnetic field.  The magnetic field from the MRI machine interacts with all the little tiny magnetic fields of the atoms and lines them up in the same direction, then can tell the density of it by the density of the atomic nuclei.  The sound you hear from the MRI machine is two fold.  First the magnetic fields are not made by actual magnets, they are electromagnets that run huge currents in circles to create the magnetic fields.  The currents are so big that some of the energy is given off as heat and sound.  This is the loud buzzing sound you hear, similar to buzzing power lines.  The second noise is all the motors that move the electromagnet around so it can look at different parts of the body and different angles.  The electromagnet is very heavy so the motors strain a lot to move it around, creating a lot of noise.
580964
Gamma decay is probably the one you are after.\nTransitions in the energy levels of the nucleons is the process behind it.\nNuclear Magnetic Resonance is also a nuclear process and would make a better answer as the wavelength of radiation is much safer.
37296
NMR stands for Nuclear Magnetic Resonance which is a physical phenomenon based upon the magnetic property of an atom's nucleus. Not all nuclei possess magnetism. NMR studies a magnetic nucleus, like that of a hydrogen atom (1H is the most receptive isotope at natural abundance), by aligning it with a very powerful external magnetic field and perturbing this alignment using an electromagnetic field. The response to the field (the perturbing), is what is exploited in NMR spectroscopy and magnetic resonance imaging.\n\nNMR spectroscopy is one of the principal techniques used to obtain physical, chemical, electronic and structural information about a molecule. It is the only technique that can provide detailed information on the exact three-dimensional structure of biological molecules in solution. Also, NMR is one of the techniques that has been used to build quantum computers.