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Which of the following is the disadvantage of conventional mode of spectrometer or continuous-wave NMR spectrometer?

Which of the following is the disadvantage of conventional mode of spectrometer or continuous-wave NMR spectrometer? Correct Answer Excitation is inefficient

The disadvantage of conventional mode of a spectrometer or continuous-wave NMR spectrometer is that the excitation is inefficient. Only a narrow band of frequencies are contributing to the signal at a time.

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