Spectroscopy
Beer's Law states that

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

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Spectroscopy
Vibrational spectroscopy is

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

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