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
None of these
absence of broad spectrum of wavelenth
the Fourier Transfer Algorithm allows us to scan all frequencies at once

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Spectroscopy
Beer's Law states that

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

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