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= 15.30 mhz. the static magnetic field from the rare-earth magnet is:

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Diamond will scratch quartz. true or false

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87