The precession frequency of a nuclear magnetic moment depends on the net magnetic field on the nucleus, and the type of nucleus. In the Pulsed NMR experiment, the static magnetic field (Bo) comes from the rare-earth magnets, and the nucleus is a single proton (from the hydrogen atom). In this case, the proportionality factor is 4.258 MHz/KG. .D Question 1 2 pts You adjust the frequency of the rf oscillator on the NMR electronics until there is negligible beating between the oscillator and the spin precessions, yielding equal frequencies of f=15.33 MHz. The static magnetic field from the rare-earth magnet is: Bo = _ KG. D Question 2 2 pts A primary cause of dephasing during nuclear precession comes from local variations in the magnetic field, AB. The mechanism can be characterized by the relationship connecting the actual spin-spin relaxation rate (1/T2) to the apparent spin-spin relaxation rate by 1/T2* = 1/T2+ yAB. Here y is the gyromagnetic ratio, which is related to the resonance condition by fo = ( 27 ) Bo. First assume that the average frequency of precession in a sample is fo = 15.24 MHz, due to an average magnetic field of Bo = 3.579 KG. You measure an apparent spin-spin relaxation time of T2* = 586 us. The resulting range of magnetic fields is AB = G. Hint: you may ignore 72 because it is much larger than T2*