Does it is a question from some test?

X-Ray - It's basically a diffraction at quantum level.

While diffraction occurs whenever propagating waves encounter such changes, its effects are generally most pronounced for waves whose wavelength is roughly comparable to the dimensions of the diffracting object or slit.

Diffraction - Wikipedia

NMR - Found on absorption/emission effect. Here you don't need comparable sizes of wavelenght and object. What's matter here is a difference in two energy states (difference in energy levels of spin states, for 1H -1/2 ; 1/2) that must be exact as an energy of radiofrequency waves.

It's comparable with UV/VIS spectroscopy. Absorption of light waves energy to excite electrons, and emission when they relax to ground state.