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

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

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FT IR Spectroscopy
In FT-NMR, how are nuclei excited?

By an intense pressure
By an intense pulse of radiation which contains a wide range of frequencies
None of these
By radio-frequency radiation whose frequency is swept across a predetermined range

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