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
None of these
To increase sensitivity

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FT IR Spectroscopy
When radiation energy is absorbed by a spin 1/2 nucleus in a magnetic field, what happens?

The nucleus spins faster
None of these
The processional frequency of the nucleus increases
The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field

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FT IR Spectroscopy
In scanning electron microscopy

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
a specimen is fixed and then coated with transition metal

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