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

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

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

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

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