Spectroscopy
In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the

light is faster today that it used to be
absence of broad spectrum of wavelenth
the Fourier Transfer Algorithm allows us to scan all frequencies at once
None of these

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Spectroscopy
Beer's Law states that

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

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Spectroscopy
Vibrational spectroscopy is

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

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