FT IR Spectroscopy
The frequency of precession, the transition frequency and the Larmor frequency are

same terms for the same frequency
different terms for the same frequency
same terms for the different frequency
different terms for the different frequency

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FT IR Spectroscopy
Why is it advantageous to record many FID signals from the same sample and then add them together?

To increase sensitivity
To ensure that all target nuclei in the sample have been excited
To remove inaccuracies caused by fluctuations in the applied magnetic field
None of these

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