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

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

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FT IR Spectroscopy
What is meant by rotating frame of reference?

None of these
If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space
That the detector rotates around the sample
That the sample is spun rapidly in the applied field

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