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

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

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

Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
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

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Spectroscopy
Why must the voltage supplied to a tungsten lamp be very stable?

Because if it wasn't, the lamp would bum out
Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
Because the lamp will only function at a specific voltage
All of these

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