Spectroscopy
Molar absorbtivity is the measure of the

amount of light reflected and absorbed per unit concentration
amount of light absorbed per unit concentration
amount of light absorbed per unit length
None of these

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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
None of these
absorbance is equal to P0 / P

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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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