Spectroscopy
Molar absorbtivity is the measure of the

None of these
amount of light reflected and absorbed per unit concentration
amount of light absorbed per unit concentration
amount of light absorbed per unit length

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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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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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