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
None of these
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

a specimen is fixed and then coated with transition metal
None of these
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

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