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 remove inaccuracies caused by fluctuations in the applied magnetic field
To ensure that all target nuclei in the sample have been excited
To increase sensitivity

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FT IR Spectroscopy
In scanning electron microscopy

None of these
a specimen is not fixed and then coated with thin layer of a heavy metal
a specimen is fixed and then coated with transition metal
a specimen is fixed and then coated with thin layer of a heavy metal

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FT IR Spectroscopy
What does the Michelson interferometer do?

None of these
Split a polychromatic beam of radiation into its component wavelengths
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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