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 ensure that all target nuclei in the sample have been excited
To increase sensitivity
None of these

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FT IR Spectroscopy
What does the Michelson interferometer do?

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

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FT IR Spectroscopy
In scanning electron microscopy

a specimen is fixed and then coated with thin layer of a heavy metal
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
None of these

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