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
None of these
Selectively filter certain wavelengths from a beam of I.R. radiation
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 fixed and then coated with transition metal
None of these
a specimen is not fixed and then coated with thin layer of a heavy metal

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