Spectroscopy
Beer's Law states that

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
absorbance is equal to P0 / P
None of these

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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
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
Because rotational transitions are extremely rare

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Spectroscopy
Vibrational spectroscopy is

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

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