Spectroscopy
Which of the following components of a monochromator is the dispersing element?

The collimating lens
The entrance slit
The diffraction grating
None of these

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

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