Spectroscopy
Which of the following will oscillate the fastest?

A small mass on a weak spring
A large mass on a weak spring
A large mass on a stiff spring
A small mass on a stiff spring

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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, 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

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Spectroscopy
Vibrational spectroscopy is

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

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