Spectroscopy
Vibrational spectroscopy is

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

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

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

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Spectroscopy
Beer's Law states that

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

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