Spectroscopy
Vibrational spectroscopy is

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

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

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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 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
All of these

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Spectroscopy
Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?

None of these
Because absorbance is proportional to the concentration of the analyte, whereas %T is not
Because %T is dependant on the power of the incident radiation
Because %T cannot be measured as accurately as absorbance

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