uestion 7 In a pulsed NMR experiment, a sample has a T of 0.8 seconds. The net m
ID: 1996879 • Letter: U
Question
uestion 7 In a pulsed NMR experiment, a sample has a T of 0.8 seconds. The net magnetization from the sample is set equal to zero and then allowed to recover towards its equilibrium value. After 1.0 seconds, what fraction of the equilibrium magnetization value will be present? Explain. uestion 8 In an NMR experiment, what is the energy of the photon that will be absorbed by a 'H nucleus in a 4.7 Tesla magnetic field? Explain. uestion 9 In an atom, how many electron states are in the n 3 shell? Explain. uestion 10 The configuration of the potassium atom is 1s2 2s2 2ps 3s2 3p6 4s1. Which of the following statements about potassium is true? Explain a. Its n-3 shell is completely filled. b. Its 4s subshell is completely filled. c. Its least tightly bound electron has 1-4. d. Its atomic number is 17 e. Its electron charge distribution is spherically symmetric.Explanation / Answer
7. The equation that describes the behaviour with time When Mz= 0, after its displacement is Mz=M0(1-e-t/T1)
Substituting t=1s and T1=0.8s Mz= 0.7135M0.
8. Energy of photon = hv = Gamma xhxB0 = 2.67513x108x6.626x10-34x4.7 = 8.33x10-25J.
9. When principle Quantum number is 3, then L =0,1,2 implies S,P,D ie 3S2,3P6, 3D10 .
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