Spectroscopy
Which of the following relationships between absorbance and %transmittance is incorrect?

All are correct
A = log10 1 / T
A = log10 100 / %T
A = 2 - log10 %T

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

All of these
Because rotational transitions are extremely rare
Because the energy required to induce a rotational transition is so small that it cannot be measured
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
None of these
absorbance is proportional to both the path length and concentration of the absorbing species

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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
Because %T cannot be measured as accurately as absorbance
Because %T is dependant on the power of the incident radiation
None of these

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