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
light is faster today that it used to be
the Fourier Transfer Algorithm allows us to scan all frequencies at once
absence of broad spectrum of wavelenth

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

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

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Spectroscopy
Beer's Law states that

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

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Spectroscopy
Vibrational spectroscopy is

a large mass on a weak spring
an Infrared spectroscopy
a flashlight through a prism and shake it
a class of spectroscopic techniques which analyzes molecular motions

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