Spectroscopy
Why are rotational transitions of little use to a spectroscopist?

Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
Because rotational transitions are extremely rare
All of these
Because the energy required to induce a rotational transition is so small that it cannot be measured

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Spectroscopy
Beer's Law states that

absorbance is equal to P0 / P
absorbance is proportional to both the path length and concentration of the absorbing species
absorbance is proportional to the log of the concentration of the absorbing species
None of these

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Spectroscopy
In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the

None of these
the Fourier Transfer Algorithm allows us to scan all frequencies at once
absence of broad spectrum of wavelenth
light is faster today that it used to be

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