Radio wave region

NMR transitions correspond to wavelengths in the radio wave region of the spectrum, vibrational transitions correspond to wavelengths in the IR region, and electronic transitions to the UV-Vis region,... 

Radars and cordless telephones also use electromagnetic radiation in the microwave region. The wavelength of the electromagnetic waves used in radio and T V broadcasting usually ranges between 1 and 1000 m in the radio wave region of the spectrum. 

This resonance frequency is called the Larmor frequency. In nuclear magnetic resonance spectroscopy, the resonance is determined either by varying the radiation frequency (typically in the radio wave region) or by varying the applied magnetic field strength. 

Thus far, we have been especially concerned with absorption detectors operating in the optical and infrared regions of the electromagnetic spectrum (hv kT, where k is the Boltzmann constant and T is the detector temperature). In this case, the intensity of the incoming wave is obtained from the analytic signal and excludes double- and sum-frequency components [7.10, 12-14]. Nevertheless, (7.77) is a general result for intensity detection which applies also to the microwave and radio wave regions (hv< kT). 

This is in the radio wave region of the electromagnetic spectrum. 

Radio With radiation of wavelengths exceeding 100 mm we finally run into the radio wave region, where frequencies are commonly reported in MHz (10 Hz). Photon energies here are too small to lead to transitions associated with electronic or nuclear movement, but they can produce transitions between spin states (nuclear magnetic resonance). 

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