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

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

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Spectroscopy
Vibrational spectroscopy is

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

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

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

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Spectroscopy
Beer's Law states that

None of these
absorbance is equal to P0 / P
absorbance is proportional to both the path length and concentration of the absorbing species
absorbance is proportional to the log of the concentration of the absorbing species

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

All of these
Because rotational transitions are extremely rare
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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