i) In an applied external magnetic field, hydrogen nuclei will have different energies depending on the direction of their spins. The energy difference between nuclei with spins aligned with magnetic field and spins opposite to magnetic field is given by ÎE-yB , where γ = 267.5 à 106 Hz . T-1 (T stands for Tesla and is the unit for strength of magnetic field) and B is the strength of the applied magnetic field. Calculate the strength of magnetic field required so that the transition energy between two spin states corresponds to the energy of a photon with wavelength 0.375 m. ii) The hydrogen nuclei in real molecules are surrounded by electrons. The electrons will generate a current and offset part of the applied external magnetic field. This effect will be stronger for higher electron densities. In order to quantize this effect, we introduce a 'shielding factor' α so the effective magnetic field experienced by the hydrogen nuclei is given by BeffaB For hydrogen atoms attached to sp3 carbon atoms, consider the following simplified model: α-1-0.01 * (4-number of H attached to the carbon) Use this model, calculate the NMR transition frequencies that can be expected for molecule isobutane (you can find its structure online) if the strength of the external magnetic field is the same as in i).