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

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

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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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