Spectroscopy
Vibrational spectroscopy is

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

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

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

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

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

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