FT IR Spectroscopy
What does the Michelson interferometer do?

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

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

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

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

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