Nuclear magnetic resonance (NMR) is one of a large range of phenomena associated with the interaction of electromagnetic radiation with matter.The examples of this interaction include the attenuation of X-rays by lead, the visible emission and atoms spectra absorption, microwave heating and radio frequency (RF) induction heating of metals. The frequency of the electromagnetic radiation involved. X-rays have a typical frequency of around 1018Hz, while the orange light of the sodium lamp corresponds to about 5 x 1014 Hz. Microwave cookers operate at frequencies of order 109Hz and RF induction heaters use a frequency of order 106Hz.
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