FT IR Spectroscopy
What does the Michelson interferometer do?

Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector
Split a polychromatic beam of radiation into its component wavelengths
Selectively filter certain wavelengths from a beam of I.R. radiation
None of these

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

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

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