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 increase sensitivity
To ensure that all target nuclei in the sample have been excited

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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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