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

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

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

All of these
Because the energy required to induce a rotational transition is so small that it cannot be measured
Because rotational transitions are extremely rare
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
Vibrational spectroscopy is

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

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

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

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