Discussion
Nuclear Magnetic Resonance (NMR) spectrometer normally operates at :
Answer: A
An NMR spectrometer operates in the Radio frequency region.
Nuclear spin energy levels split in a magnetic field by very small amounts. For protons in fields of a few tesla, the resonance frequency is tens to hundreds of megahertz, for example 400 MHz at 9.4 T, which lies in the radio frequency range.
Microwaves are used for electron spin resonance (ESR) and for rotational spectra, ultraviolet radiation excites electronic transitions, and audio frequencies are far too low for nuclear resonance in practical fields.
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