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
None of these
Selectively filter certain wavelengths from a beam of I.R. radiation

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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?

None of these
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

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

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

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