Spectroscopy
Vibrational spectroscopy is

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

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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

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

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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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