Spectroscopy
Beer's Law states that

None of these
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
absorbance is equal to P0 / P

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Spectroscopy
Vibrational spectroscopy is

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

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