23-1. Show that the range of static magnetic field strengths 0.1 to 2.0

tesla corresponds to the resonance frequencies 4.3 to 86 MHz for

hydrogen. By using data from Table 23-1, find the corresponding

resonance frequencies for 19F and 13C.

23-2 Find the number of 13C nuclei in 1 mg of pure 13C. By using the

data in Table 23-1, determine the number of milligrams of 13C

needed to give the same signal as a cubic millimeter of water (see

Example 23-2).