Suppose that the 13C nuclei in a molecule in a 600 MHz spectrometer can be 100% polarized (p = 1). If T1 = 5.0 s, how long does it take for p to reach a value equal to twice the thermal equilibrium polarization at 298 K?
(A)[The polarization relaxes exponentially: p(t) = [p(0) - peq]exp(-t/T1) + peq.] (B)72.0 s (C)56.6 s (D)12.7 s
B