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

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

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

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

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Spectroscopy
Beer's Law states that

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

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