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

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

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Spectroscopy
Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?

Because %T cannot be measured as accurately as absorbance
Because %T is dependant on the power of the incident radiation
None of these
Because absorbance is proportional to the concentration of the analyte, whereas %T is not

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